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* OutOfClothesExperience: Exclusive to the manga version, when Shera sees through her Turkey Shot's eyes, her spirit is depicted floating next to the Turkey Shot, naked except for her collar and hair ties.
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''How Not to Summon a Demon Lord'' is a LightNovel by Creator/YukiyaMurasaki with illustrations by Takahiro Tsurusaki.
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''How Not to Summon a Demon Lord'' (''Isekai Maō to Shōkan Shōjo no Dorei Majutsu'', literally "The Other World Demon Lord and the Summoning Girl's Slave Magic") is a LightNovel series of LightNovels written by Creator/YukiyaMurasaki with illustrations by Takahiro Tsurusaki.
Tsurusaki, which began publication in 2014.
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* CastingGag: Creator/JadSaxton voicing a CatGirl. This is [[Manga/FairyTail not the first,]] [[LightNovel/HighSchoolDXD nor the second,]] [[VideoGame/{{Paladins}} or even the third time]] she's taken this sort of role.
** This isn't the [[LightNovel/Overlord2012 first time]] Creator/YumiHara voices a beautiful woman with a MaskOfSanity. Best exemplified in episode 11.
** This isn't the [[LightNovel/Overlord2012 first time]] Creator/YumiHara voices a beautiful woman with a MaskOfSanity. Best exemplified in episode 11.
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* CastingGag: Creator/JadSaxton voicing a CatGirl. This is [[Manga/FairyTail not the first,]] [[LightNovel/HighSchoolDXD [[Literature/HighSchoolDXD nor the second,]] [[VideoGame/{{Paladins}} or even the third time]] she's taken this sort of role.
** This isn't the[[LightNovel/Overlord2012 [[Literature/Overlord2012 first time]] Creator/YumiHara voices a beautiful woman with a MaskOfSanity. Best exemplified in episode 11.
** This isn't the
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** There is a scene in Volume 6 where Diablo wishes he could [[LightNovel/ReZero Return by Death]].
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** There is a scene in Volume 6 where Diablo wishes he could [[LightNovel/ReZero [[Literature/ReZero Return by Death]].
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* TheCameo: The original broadcast version of Season 2 episode 2 features a quick cameo of ''WebAnimation/{{Hololive}}'s'' Pekora Usada. She's color swapped, but still wears her trademark pigtails, hair carrots, and Don-chan wrap.
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* TheCameo: The original broadcast version of Season 2 episode 2 features a quick cameo of ''WebAnimation/{{Hololive}}'s'' Pekora Usada. She's color swapped, but still wears her trademark pigtails, hair carrots, and Don-chan wrap.Don-chan.
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* TheCameo: The original broadcast version of Season 2 episode 2 features a quick cameo of ''WebAnimation/{{Hololive}}'s'' Pekora Usada. She's color swapped, but still wears her trademark pigtails and hair carrots.
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* TheCameo: The original broadcast version of Season 2 episode 2 features a quick cameo of ''WebAnimation/{{Hololive}}'s'' Pekora Usada. She's color swapped, but still wears her trademark pigtails and pigtails, hair carrots.carrots, and Don-chan wrap.
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* CastingGag: Creator/JadSaxton voicing a CatGirl. This is [[Manga/FairyTail not the first,]] [[LightNovel/HighSchoolDXD nor the second,]] [[VideoGame/{{Paladins}} or even the third time]] she's taken this sort of role.
** This isn't the [[LightNovel/Overlord2012 first time]] Creator/YumiHara voices a beautiful woman with a MaskOfSanity. Best exemplified in episode 11.
** [[Manga/FairyTail It won't be the last time]] Creator/SayakaOhara has voiced a red-haired woman.
** This isn't the [[LightNovel/Overlord2012 first time]] Creator/YumiHara voices a beautiful woman with a MaskOfSanity. Best exemplified in episode 11.
** [[Manga/FairyTail It won't be the last time]] Creator/SayakaOhara has voiced a red-haired woman.
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* ChekhovsGun: The potions Diablo makes with Shera end up being used in Episode 12 to save Rem's life.
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* ChekhovsGun: ChekhovsGun:
** The potions Diablo makes with Shera end up being used in Episode 12 to save Rem's life.
** The potions Diablo makes with Shera end up being used in Episode 12 to save Rem's life.
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/a20582_35128979971521645185.jpg]]
[[caption-width-right:350:Our Demon Lord and his lovely slaves]]
''How Not to Summon a Demon Lord'' is a LightNovel by Creator/YukiyaMurasaki with illustrations by Takahiro Tsurusaki.
The MMORPG ''Cross Reverie'' had one player who was [[WorldsStrongestMan stronger than everyone else]], earning him the nickname of "Diablo, the Demon Lord." In real life, however, he is Takuma Sakamoto, a boy with NoSocialSkills. One day, he gets sucked into another world, but with his appearance as Diablo instead of his normal form. There, the two girls who summoned him cast a spell on him to [[MadeASlave enslave him]].
However, Takuma has a skill from ''Cross Reverie'' that reflects the magic back onto the girls, enslaving them to his will instead! Panicking, Takuma says to them "''I'm amazing you say? Of course, I am. I'm Diablo... The one feared as the Demon Lord!''"
Stuck in another world, Takuma (as Diablo) has no choice but to go on an adventure with his newfound companions.
An Anime TV series produced by Creator/{{Ajiado}} Animation Works and directed by Yuta Murano premiered on July 5, 2018. Creator/{{Funimation}}'s Simuldub of the anime series premiered on July 25th, 2018. Watch it [[https://funimation.com/shows/how-not-to-summon-a-demon-lord/ here]] or subbed on Crunchyroll [[http://www.crunchyroll.com/en-gb/how-not-to-summon-a-demon-lord here]]. A second season of the anime, now animated by [[Creator/MushiProductions Tezuka Productions]], premiered on April 9, 2021 on Crunchyroll.
----
!!''How Not to Summon a Demon Lord'' provides examples of:
* AdaptationExpansion: The anime covers things that neither the manga nor the light novel do. Like the fact that the reason Diablo's got NoSocialSkills is that he's been shunned, for basically no reason, since he was a small child.
* AllDeathsFinal: Diablo learns that while resurrection spells are common in ''Cross Reverie'', they don't exist in this world and the dead stay dead.
** Volume 10 introduces "Thanatos the Immortal" who seems to avert this when he was killed gorily by Europa but shows up moments later fine.
* AnimalEyeSpy: The <Turkey Shot>, a summoned beast that is weak offensively but has the Skill to let the <Summoner> see what it sees.
* AutopilotArtistry: As a ''Cross Reverie'' player, Takuma Sakamoto was an expert potionmaker. However, when he becomes TrappedInAnotherWorld as his PlayerCharacter Diablo, he initially has no idea how to make them. He finally figures out that the only way he can make them is by [[EatingTheEyeCandy staring at Shera's bosom]] so that he's thinking about her assets instead of potionmaking.
* BizarreSexualDimorphism: Kobolds. Their females look like dwarves, albeit with fox rather than dog features, but the males all have the heads of foxes.
* BlackAndGreyMorality: Volume 12 introduces the Gelmudo Empire, which is morally pitch black, and is so heinous, they make the Fallen, ''at their worst'', look downright benevolent by comparison.
* CallBack: In the fourth novel, Rem strongly advises Lumachina to spill the beans at once about her situation, lest she "will invite a situation upon herself that she will never forget throughout her whole life." This hard-earned bit of dubious wisdom comes the time when Diablo "tortured" her into confessing her problems back in the first novel by [[FantasticArousal teasing her cat ears into an]] ImmodestOrgasm.
* TheCameo: The original broadcast version of Season 2 episode 2 features a quick cameo of ''WebAnimation/{{Hololive}}'s'' Pekora Usada. She's color swapped, but still wears her trademark pigtails and hair carrots.
* CerebusSyndrome: While the story was never full of sunshine and rainbows, in Volume 12, things get real dark, real quick, with the introduction of the Gelmudo Empire, who use ChildSoldier elites, the racist human commanders literally stomping their heads into the ground until they bleed, for the slightest insubordination or failure, real or imagined, with the army bent on conquest, enslaving all they run across, and run by an ImmortalitySeeker Emperor on his deathbed, desperate for results to capture a certain Pantherian...
* ChekhovsGun: The potions Diablo makes with Shera end up being used in Episode 12 to save Rem's life.
** When Rem teaches Shera how to summon Turkey Shot, she also gives Diablo a magic stone used for contracts. This becomes useful when he tries to find a way for Klem to be allowed in Faltra - by using the enslavement contract on her.
* CityOfAdventure: By design. The city of Faltra is on the frontier between the Human kingdom, several demi-human races, especially elves, and the Fallen. A second one ends up being Zircon Tower City, where desert adventures regularly venture out to the sands, risking life and limb for precious treasures buried in forgotten tombs.
* DoubleStandardRapeFemaleOnMale: In both Volume 8 and 11.
** Volume 8: [[spoiler: Raphlesia corners Diablo, on his wedding night, and starts coming on to him, strongly, as "thanks" for saving her life in the wake of Demon King of the Heart Cardia fiasco, despite his protests, and the fact that he's already married to Shera and Rem. Rem chances upon it and is enraged, to the point that she doesn't speak to him for a full week afterward.]]
** Volume 11: [[spoiler: Diablo gets accosted by Rem's aunt, who promises to teach him a secret clan technique, that he was already starting to figure out after she deflected one of his spells with her bare hands, and starts by putting his hands on her breasts, which isn't too different from the manner in which he learned Aura Vision with Shera. Unfortunately, this is just a trick she used to get his guard down so she could literally paralyze Diablo, by magically short-circuiting his nervous system. Then she proceeds to strip his pants and performs oral sex on him, against his will, even acknowledging it's wrong to do so, but treating it like a harmless prank. "Hee Hee! As Rem's oneesan, I shouldn't be doing this, no?" Shortly after the deed is done, Rem walks into the area, not angry, not ranting, raving, or violent. She just simply divorces him, on the spot, leaving him completely speechless.]]
* ElementalPowers: The Elemental Magic system found in both ''Cross Reverie'' game and the world Takuma was summoned to. The game favors the system, while the world looks down on it.
** CastingAShadow
*** GravityMaster
*** PowerOfTheVoid
** BlowYouAway
** DishingOutDirt
** LightEmUp
** MakingASplash
*** AnIcePerson
** PlayingWithFire
*** HavingABlast
* {{Elfeminate}}: Some of the male Elves such as Celsior.
* EnemyCivilWar: The Fallen actually don't get along with each other very well. The only thing that makes them combine their efforts is their hatred for the Six Races. The members of the Vhal faction are little more than mindless beasts who attack the six races on sight without plan or preparation, and if they don't have the opportunity to attack just blend quietly into the forest that is their home. The "moderate" faction is desperate to wipe out as many of the six races as they can, but only strike when they believe they have a winning strategy in place. While the Edelgard faction doesn't care for the six races very much, they're content with "live and let live" if they're not directly antagonized, and seek only to serve the Demon Lord. The last two really don't like each other and have come to blows, repeatedly.
* ExpandedUniverse: The new world. At first glance, it possess the same elements as from the game ''Cross Reverie'' that Diablo is familiar with. However, he later discovers that it possesses elements that weren't in the base game, such as Keera's mind control flute and the Force Hydra, or Rose's offensive abilities. This leads Diablo to the conclusion that ''every planned element'' from ''Cross Reverie'' is in the new world.
* FantasticArousal: Not only does Diablo accidentally discover that Rem (like presumably most Pantherians), have very "sensitive" ears, but when volume 3 rolls around, part of the process involved trying to remove the slave collars that Rem and Shera accidentally got by having their summon contract on Diablo rebound, involves manipulating and inserting mana into others. His reluctant model, Shera, has an ''interesting'' reaction, and later puts Rem through the same experience.
** Klem's horns later turn out to have a similar effect.
* FantasticRacism: Appears in both ''Cross Reverie'' and the other world. In the game, it is more of a background setting. In the other world, it is a reality that some of the Humans discriminate against Demi-humans.
* FictionalVideoGame: ''Cross Reverie'', the MMORPG that Takuma played and often references to compare the world he was summoned in.
* FighterMageThief: The main job classes of adventurers in both ''Cross Reverie'' and the world are "Warrior", "Sorcerer", and "Archer". They have further derivations depending on what they specialize in.
* FirstTown: In ''Cross Reverie'', the first town is the Royal Capital Sevenwall.
* FormulaWithATwist: The series is based on the twist that the protagonist is only ''pretending'' to be a Demon Lord. He ''is'' exceptionally powerful in the new world, but being called a Demon Lord in the first places was only an AppropriatedAppelation he used while playing his MMORPG.
* FunnyBackgroundEvent: In episode 12, after Sylvie susses out that [[spoiler: the little blonde girl traveling with them is Krebskrum reborn]], Emile spends the rest of the conversation standing in the background, unmoving, rigid with shock, and sporting a pair of BlankWhiteEyes.
* GodlikeGamer: Takuma fit this to a T. In the MMORPG "Cross Reverie", he played as the Demon Lord Diablo, who was so ridiculously skilled and powerful that no one dared to challenge him. In fact, he decided to hold back in order to keep things fun for himself. Then he's cast into said world where he's reincarnated as his character and finds everyone else is laughably underleveled.
* GRatedSex: Subverted. The process to separate Krebskulm's soul from Rem first appears to simply involve giving Krebskrum large amounts of mana. [[spoiler:Unfortunately, to give the mana to Krebskulm, and not to Rem, Diablo has to remove Rem's panties and insert his finger somewhere very, very delicate.]]
* GrayAndGreyMorality: Surprisingly enough. While the Fallen are shown doing some terribly nasty things, at least on the battlefield, they are fighting for their very survival from extremists like the Holy Knights, and if there's no reason to fight, some like Edelgard's faction, are perfectly content with being civil, polite, and happily tolerating peaceful coexistence. However, that only constitutes a small minority of the Fallen, most of whom want nothing more than the genocide of the six races. The six races also aren't shown to be much better, with FantasticRacism in every possible direction, banditry, slavery, although highly idealized, and horrifically brutal KnightTemplar GeneralRipper "Holy Knights" that have carte blanche to declare anyone "guilty" of being a Demon Lord Worshiper, resulting in inflicting TortureForFunAndInformation and then "granting them salvation" by killing them, at the level of entire towns! [[spoiler:Thankfully, the Holy Knights and the Church as a whole are successfully reformed later in the light novels (if only due to all the corrupt officials being wiped out by that point).]]
* HalfHumanHybrid: Noted to be basically nonexistent. It's said that the six races cannot interbreed. [[spoiler:There is a way around that, however.]]
* HappinessInSlavery: When Diablo is introduced to a slave trader, the slaves are universally happy, and healthy in both mind and body. His two traveling companions Rem and Shera grow accustomed, and even ''fond'' of their slave collars that resulted from a magic accident, to Diablo's internal dismay, and the law of the land is that abusing slaves is a felony with harsh, undisclosed consequences. Even patrons to a legally sanctioned slave tent require a screening and a referral from a renown and reputable town authority and are considered equivalent to patrons looking to buy a beloved pet, not someone seeking to exploit people. Although it is often noted that there are ''illegal'' slave-traders in the setting as well. In-universe, this is highlighted as roughly being the equivalent of the difference between a pharmacy dispensing medicine with a valid prescription, and the way drug dealers operate.
* HerosSlaveHarem: One of the {{Trope Codifier}}s. When Diablo is summoned, his ring that deflects all magic reverses the slave spell that the two girls who summoned him had used and thus makes them ''his'' slave instead of the other way around. At first, no one is happy with the arrangement and look for ways of reversing the spell, but after Diablo shows himself to be a NiceGuy underneath his JerkassFacade, the girls fall in love with him. He acquires more girls later (some, though not all, being slaves as well).
* HumongousMecha: The pillar of Gelmudo's war-machine.
* ItMakesSenseInContext: Diablo describes his situation in the fourth novel thusly:
-->Like this, Diablo misrepresented himself as God for the sake of biscuit expenses and avoiding marriage.
* ImagineSpot: Diablo has a few where he pictures himself and other characters in scenarios set in his original world.
* ItAlwaysRainsAtFunerals: Three days after the Fallen's assault on the city, the funeral was held for all the adventurers that were killed by Grigore and appropriately enough, it was raining.
* KarmaHoudini: Despite having his plans foiled by Diablo, Chester faces no punishment for his more morally ambiguous actions.
* KilledOffForReal: In ''Cross Reverie'', the worst that can happen to a player when they are killed is a level-down penalty and a re-spawn at the last town they visited. In this world however, death is permanent. As such, very few people would be willing to risk their lives to fight stronger monsters. Diablo also concluded this is what contributed to the circulation of what he considers low quality spells, skills, and weapons as well as the promotion of the Summoner class since it is the easiest and safest class to learn as a sorcerer and allows a higher chance of surviving a quest.
* LanguageBarrier: Kobolds and most of the "mortal races" can't understand each other, at all. The kobolds sometimes trade with dwarves, [[FantasticRacism but humans treat them like wild beasts and try to drive them out of areas they settle and make towns in.]]
* LittleBitBeastly: Three of the six races: Dwarves have dog ears and tails; Pantherians have cat ears and tails; Grasswalkers have rabbit ears and tails. The more humanoid of the Fallen have animal traits as well, usually on the reptilian side.
* AMagicContractComesWithAKiss: The slavery ritual for summoned beasts.
* MagicIsMental: To cast spells, you have to think about what their game description describes, i.e. to cast <Explosion>, Takuma has to imagine "Gathering hydrogen from the surrounding air and igniting it with magic".
* MagikarpPower: Elemental mages are considered useless and pathetic, because they, like most people, avoid fighting whenever possible, so they never reach the point where they begin getting powerful spells.
* MarryThemAll: [[spoiler:Diablo marries both Rem and Shera in Volume 8 of the light novels. (Although, there is a little mix-up with the rings to where Rem had technically married Shera instead of Diablo that takes a couple more volumes to correct.)]]
* MediaTransmigration: Takuma Sakamoto is a [[{{Hikikomori}} shut-in]] GodlikeGamer who dominates the MMORPG called Cross Reverie as a character known as Diablo the Demon Lord. But then one day he gets sucked into a world resembling Cross Reverie, where he becomes his own overpowered player avatar Diablo.
* MenAreTheExpendableGender: Male antagonists are generally far less sympathetic than female antagonists, and far more likely to end up dead. In addition, there are very few male protagonists aside from Diablo himself.
* MetaGuy: By nature of being from the real world, Diablo is aware of game quirks, and constantly lampshades various game tropes or comments on how things work for him in the game versus the game world.
* MuggingTheMonster: Most of the antagonists go and provoke Diablo, or his companions, without knowing anything about them, finding out too late that they're way outclassed. It eventually segues into BullyingADragon and TooDumbToLive because people '''still''' go out of their way to provoke Diablo when his power, intelligence, competence, and tendency to brutally beat down people who threaten him and his companions becomes well known.
* NewLifeInAnotherWorldBonus: Diabolo possesses his MMORPG Cross Reverie's avatar granting him all of its abilities including his counter-stop level 150.
** His most used equipment being The Demon Lord's Ring, a drop from defeating the Demon Lord of the Mind, Enkvalos, working as an absolute AttackReflector against anything classified as magic. The only downside is that it also reflects positive magic cast on him such as healing and status buff spells.
* NoodleIncident: One thing the story never explained so far is how Rem and Shera both came to be at the Starfall Tower.
* OurDemonsAreDifferent: There are at least four classifications:
** Demon Lords: Absolute forces of evil that were separated into pieces and sealed away long ago.
*** While Diablo claims to be one himself (from another world), he's actually just performing a huge roleplay bluff.
** Demonic Beast: Monsters in the wild.
** Fallen: An intelligent race that is depicted as antagonistic to the six races and subservient to the Demon Lords.
** Demons: One of the six races. They look like humans with tattoo markings that are said to be descended from the Fallen.
* OverdrawnAtTheBloodBank: Played for some VERY dark laughs at the Adventurer's Guild. Instead of just signatures, the guild requires you to also sign your contract with blood, obtained via a knife. Diablo tries to cut slightly, ends up going to the bone, and [[HighPressureBlood spraying a poor guild clerk, the counter, the wall behind her, and over half of his contract with blood.]] In the next shot inside the Guildmaster's office, she's seen holding the contract, which is now soaked completely red from the bottom half.
* PragmaticAdaptation: The manga and anime adaptations omit, move, and alter some events from the light novels.
* ReadingsAreOffTheScale: There is a mirror that measures people's PowerLevels, measured by how much of your image you can clearly see in it. When Diablo tries it, he's too powerful, so it malfunctions and shuts down. In the anime, it's portrayed as causing the entire area around the guild to suddenly go dark after a bubble of red lightning-like streaks expands from the now pitch-black mirror.
* RPGMechanicsVerse: The world that Takuma was summoned to that is similar to the game ''Cross Reverie''. It has levels, skills, and other things from the game.
* SeparatedByACommonLanguage: The light novels and English anime sub use the British term "biscuit" to describe Klem's favorite food, whereas the English dub of the anime goes with the American term of "cookie".
* ShoutOut:
** There is a scene in Volume 6 where Diablo wishes he could [[LightNovel/ReZero Return by Death]].
** A [[PaletteSwap palette-swapped]] {{Expy}} of [[WebAnimation/{{hololive}} Usada Pekora]] appears as a [[https://www.youtube.com/watch?v=159MXyj2Rco background character]] in the original broadcast version of Season 2 Episode 2.
* SlaveCollar: Slaves and contracted summoned beasts wear magically conjured ones. It's an early plot point that both types are almost indistinguishable from each other, making people assume Rem and Shera were MadeASlave.
* SpaceCompression: Present in the game of ''Cross Reverie'', but ''not'' in the world versions. As a result, a distance that would take three minutes to walk in ''Cross Reverie'' takes three hours in real life.
* StandardFantasyRaces: In the ''Cross Reverie'' game there are six races players can choose from. In the other world, the six races are the main tribesmen that populate the world. The Races are:
** [[HumansAreAverage Humans]]
** [[OurDwarvesAreAllTheSame Dwarves]]: They have the addition of having dog ears and tails.
** [[OurElvesAreDifferent Elves]]: Pointy long ears, very commonly [[{{Elfeminate}} slender to the point of androgynous]].
*** Dark Elves: Similar to Elves but have darker skin. Females have giant breasts.
** Grasswalkers: Small childlike rabbit-eared and -tailed.
** Pantherians: Cat-eared and -tailed.
** [[OurDemonsAreDifferent Demons]]: Tattooed humanoids said to be descended from the Fallen. The game has them physically weaker, but they do have high INT.
* SummoningRitual: In both the ''Cross Reverie'' game and the world, <Summoners> get summoned beasts by going to <Starfall Tower> and performing a ritual then make a slavery ritual.
* SummonMagic: A magic system found in both ''Cross Reverie'' game and the world Takuma was summoned into. The game looks down on summoning, while the world favors it. The game considers it weak, while the world puts the safety of the <Summoner> in high regard.
* {{Teleportation}}: A magic both in ''Cross Reverie'' and the other world. In the game, it is a bit common. In the other world, it is mostly just rumors and not used by the masses.
* ThirstyDesert: Zirconia, the setting of Volume 4, is this. Alongside the dangerous sand whales, the lack of water, and state of the management at the only (relatively) safe settlement in the area, [[spoiler:Diablo's personal dungeon also ends up here.]]
* TooHotForTV: A variation; the first season of the anime was officially released for free on Youtube, but was taken down shortly afterwards because it was too sexy and broke some of the rules.
* TranslatorMicrobes: For some reason that is never explained, Diablo not only understands every word said to him, regardless of the language, but when he speaks back, his words are automatically translated into the language of the people he's addressing, in their minds. He cannot read nor write in any of the native languages, however.
* TrappedInAnotherWorld: Takuma was summoned in the first chapter as his ''Cross Reverie'' character Diablo.
* TraumaInn: Deconstructed. While the game of ''Cross Reverie'' has the mechanic, in the new world, when Diablo over-used his [=MP=], and suffered the proper loss of motivation, i.e. mental strength, the apathy didn't disappear despite him being cooped up in the inn for ten days. It took him seeing Shera in GoGoEnslavement to snap him out of it. The second time it happened it took Sylvie serving him a strong alcohol with MP restoring properties to get him going again but in a drunken stupor he mistook her for a body pillow, pulled her close, stripped her naked, brought her to orgasm, and fell asleep with her still naked and unable to break free of his grip.
* TuringTest: As is revealed in Volume 11, at the founding of the human kingdom, with LoadsAndLoadsOfRaces, humanity needed some "objective" method to tell the difference between sentient beings and animals. The method they chose? You can speak common, you're a sentient, even the Fallen. You can't, you're a "dumb" animal. Then the FantasticRacism sets in...
* UnequalRites: There are two main types of magic-user, summoners and elemental mages. Summoners are near useless in ''Cross Reverie'', while in the actual world elemental mages can barely do anything.
* YinYangBomb: When light and dark elemental energies clash, they don't just cancel each other out, as one would expect. They amplify each other's destructive power in a manner eerily similar to a matter-antimatter explosion. Diablo exploits this in Volume 10 to deal with the volume's BigBad.
----
[[caption-width-right:350:Our Demon Lord and his lovely slaves]]
''How Not to Summon a Demon Lord'' is a LightNovel by Creator/YukiyaMurasaki with illustrations by Takahiro Tsurusaki.
The MMORPG ''Cross Reverie'' had one player who was [[WorldsStrongestMan stronger than everyone else]], earning him the nickname of "Diablo, the Demon Lord." In real life, however, he is Takuma Sakamoto, a boy with NoSocialSkills. One day, he gets sucked into another world, but with his appearance as Diablo instead of his normal form. There, the two girls who summoned him cast a spell on him to [[MadeASlave enslave him]].
However, Takuma has a skill from ''Cross Reverie'' that reflects the magic back onto the girls, enslaving them to his will instead! Panicking, Takuma says to them "''I'm amazing you say? Of course, I am. I'm Diablo... The one feared as the Demon Lord!''"
Stuck in another world, Takuma (as Diablo) has no choice but to go on an adventure with his newfound companions.
An Anime TV series produced by Creator/{{Ajiado}} Animation Works and directed by Yuta Murano premiered on July 5, 2018. Creator/{{Funimation}}'s Simuldub of the anime series premiered on July 25th, 2018. Watch it [[https://funimation.com/shows/how-not-to-summon-a-demon-lord/ here]] or subbed on Crunchyroll [[http://www.crunchyroll.com/en-gb/how-not-to-summon-a-demon-lord here]]. A second season of the anime, now animated by [[Creator/MushiProductions Tezuka Productions]], premiered on April 9, 2021 on Crunchyroll.
----
!!''How Not to Summon a Demon Lord'' provides examples of:
* AdaptationExpansion: The anime covers things that neither the manga nor the light novel do. Like the fact that the reason Diablo's got NoSocialSkills is that he's been shunned, for basically no reason, since he was a small child.
* AllDeathsFinal: Diablo learns that while resurrection spells are common in ''Cross Reverie'', they don't exist in this world and the dead stay dead.
** Volume 10 introduces "Thanatos the Immortal" who seems to avert this when he was killed gorily by Europa but shows up moments later fine.
* AnimalEyeSpy: The <Turkey Shot>, a summoned beast that is weak offensively but has the Skill to let the <Summoner> see what it sees.
* AutopilotArtistry: As a ''Cross Reverie'' player, Takuma Sakamoto was an expert potionmaker. However, when he becomes TrappedInAnotherWorld as his PlayerCharacter Diablo, he initially has no idea how to make them. He finally figures out that the only way he can make them is by [[EatingTheEyeCandy staring at Shera's bosom]] so that he's thinking about her assets instead of potionmaking.
* BizarreSexualDimorphism: Kobolds. Their females look like dwarves, albeit with fox rather than dog features, but the males all have the heads of foxes.
* BlackAndGreyMorality: Volume 12 introduces the Gelmudo Empire, which is morally pitch black, and is so heinous, they make the Fallen, ''at their worst'', look downright benevolent by comparison.
* CallBack: In the fourth novel, Rem strongly advises Lumachina to spill the beans at once about her situation, lest she "will invite a situation upon herself that she will never forget throughout her whole life." This hard-earned bit of dubious wisdom comes the time when Diablo "tortured" her into confessing her problems back in the first novel by [[FantasticArousal teasing her cat ears into an]] ImmodestOrgasm.
* TheCameo: The original broadcast version of Season 2 episode 2 features a quick cameo of ''WebAnimation/{{Hololive}}'s'' Pekora Usada. She's color swapped, but still wears her trademark pigtails and hair carrots.
* CerebusSyndrome: While the story was never full of sunshine and rainbows, in Volume 12, things get real dark, real quick, with the introduction of the Gelmudo Empire, who use ChildSoldier elites, the racist human commanders literally stomping their heads into the ground until they bleed, for the slightest insubordination or failure, real or imagined, with the army bent on conquest, enslaving all they run across, and run by an ImmortalitySeeker Emperor on his deathbed, desperate for results to capture a certain Pantherian...
* ChekhovsGun: The potions Diablo makes with Shera end up being used in Episode 12 to save Rem's life.
** When Rem teaches Shera how to summon Turkey Shot, she also gives Diablo a magic stone used for contracts. This becomes useful when he tries to find a way for Klem to be allowed in Faltra - by using the enslavement contract on her.
* CityOfAdventure: By design. The city of Faltra is on the frontier between the Human kingdom, several demi-human races, especially elves, and the Fallen. A second one ends up being Zircon Tower City, where desert adventures regularly venture out to the sands, risking life and limb for precious treasures buried in forgotten tombs.
* DoubleStandardRapeFemaleOnMale: In both Volume 8 and 11.
** Volume 8: [[spoiler: Raphlesia corners Diablo, on his wedding night, and starts coming on to him, strongly, as "thanks" for saving her life in the wake of Demon King of the Heart Cardia fiasco, despite his protests, and the fact that he's already married to Shera and Rem. Rem chances upon it and is enraged, to the point that she doesn't speak to him for a full week afterward.]]
** Volume 11: [[spoiler: Diablo gets accosted by Rem's aunt, who promises to teach him a secret clan technique, that he was already starting to figure out after she deflected one of his spells with her bare hands, and starts by putting his hands on her breasts, which isn't too different from the manner in which he learned Aura Vision with Shera. Unfortunately, this is just a trick she used to get his guard down so she could literally paralyze Diablo, by magically short-circuiting his nervous system. Then she proceeds to strip his pants and performs oral sex on him, against his will, even acknowledging it's wrong to do so, but treating it like a harmless prank. "Hee Hee! As Rem's oneesan, I shouldn't be doing this, no?" Shortly after the deed is done, Rem walks into the area, not angry, not ranting, raving, or violent. She just simply divorces him, on the spot, leaving him completely speechless.]]
* ElementalPowers: The Elemental Magic system found in both ''Cross Reverie'' game and the world Takuma was summoned to. The game favors the system, while the world looks down on it.
** CastingAShadow
*** GravityMaster
*** PowerOfTheVoid
** BlowYouAway
** DishingOutDirt
** LightEmUp
** MakingASplash
*** AnIcePerson
** PlayingWithFire
*** HavingABlast
* {{Elfeminate}}: Some of the male Elves such as Celsior.
* EnemyCivilWar: The Fallen actually don't get along with each other very well. The only thing that makes them combine their efforts is their hatred for the Six Races. The members of the Vhal faction are little more than mindless beasts who attack the six races on sight without plan or preparation, and if they don't have the opportunity to attack just blend quietly into the forest that is their home. The "moderate" faction is desperate to wipe out as many of the six races as they can, but only strike when they believe they have a winning strategy in place. While the Edelgard faction doesn't care for the six races very much, they're content with "live and let live" if they're not directly antagonized, and seek only to serve the Demon Lord. The last two really don't like each other and have come to blows, repeatedly.
* ExpandedUniverse: The new world. At first glance, it possess the same elements as from the game ''Cross Reverie'' that Diablo is familiar with. However, he later discovers that it possesses elements that weren't in the base game, such as Keera's mind control flute and the Force Hydra, or Rose's offensive abilities. This leads Diablo to the conclusion that ''every planned element'' from ''Cross Reverie'' is in the new world.
* FantasticArousal: Not only does Diablo accidentally discover that Rem (like presumably most Pantherians), have very "sensitive" ears, but when volume 3 rolls around, part of the process involved trying to remove the slave collars that Rem and Shera accidentally got by having their summon contract on Diablo rebound, involves manipulating and inserting mana into others. His reluctant model, Shera, has an ''interesting'' reaction, and later puts Rem through the same experience.
** Klem's horns later turn out to have a similar effect.
* FantasticRacism: Appears in both ''Cross Reverie'' and the other world. In the game, it is more of a background setting. In the other world, it is a reality that some of the Humans discriminate against Demi-humans.
* FictionalVideoGame: ''Cross Reverie'', the MMORPG that Takuma played and often references to compare the world he was summoned in.
* FighterMageThief: The main job classes of adventurers in both ''Cross Reverie'' and the world are "Warrior", "Sorcerer", and "Archer". They have further derivations depending on what they specialize in.
* FirstTown: In ''Cross Reverie'', the first town is the Royal Capital Sevenwall.
* FormulaWithATwist: The series is based on the twist that the protagonist is only ''pretending'' to be a Demon Lord. He ''is'' exceptionally powerful in the new world, but being called a Demon Lord in the first places was only an AppropriatedAppelation he used while playing his MMORPG.
* FunnyBackgroundEvent: In episode 12, after Sylvie susses out that [[spoiler: the little blonde girl traveling with them is Krebskrum reborn]], Emile spends the rest of the conversation standing in the background, unmoving, rigid with shock, and sporting a pair of BlankWhiteEyes.
* GodlikeGamer: Takuma fit this to a T. In the MMORPG "Cross Reverie", he played as the Demon Lord Diablo, who was so ridiculously skilled and powerful that no one dared to challenge him. In fact, he decided to hold back in order to keep things fun for himself. Then he's cast into said world where he's reincarnated as his character and finds everyone else is laughably underleveled.
* GRatedSex: Subverted. The process to separate Krebskulm's soul from Rem first appears to simply involve giving Krebskrum large amounts of mana. [[spoiler:Unfortunately, to give the mana to Krebskulm, and not to Rem, Diablo has to remove Rem's panties and insert his finger somewhere very, very delicate.]]
* GrayAndGreyMorality: Surprisingly enough. While the Fallen are shown doing some terribly nasty things, at least on the battlefield, they are fighting for their very survival from extremists like the Holy Knights, and if there's no reason to fight, some like Edelgard's faction, are perfectly content with being civil, polite, and happily tolerating peaceful coexistence. However, that only constitutes a small minority of the Fallen, most of whom want nothing more than the genocide of the six races. The six races also aren't shown to be much better, with FantasticRacism in every possible direction, banditry, slavery, although highly idealized, and horrifically brutal KnightTemplar GeneralRipper "Holy Knights" that have carte blanche to declare anyone "guilty" of being a Demon Lord Worshiper, resulting in inflicting TortureForFunAndInformation and then "granting them salvation" by killing them, at the level of entire towns! [[spoiler:Thankfully, the Holy Knights and the Church as a whole are successfully reformed later in the light novels (if only due to all the corrupt officials being wiped out by that point).]]
* HalfHumanHybrid: Noted to be basically nonexistent. It's said that the six races cannot interbreed. [[spoiler:There is a way around that, however.]]
* HappinessInSlavery: When Diablo is introduced to a slave trader, the slaves are universally happy, and healthy in both mind and body. His two traveling companions Rem and Shera grow accustomed, and even ''fond'' of their slave collars that resulted from a magic accident, to Diablo's internal dismay, and the law of the land is that abusing slaves is a felony with harsh, undisclosed consequences. Even patrons to a legally sanctioned slave tent require a screening and a referral from a renown and reputable town authority and are considered equivalent to patrons looking to buy a beloved pet, not someone seeking to exploit people. Although it is often noted that there are ''illegal'' slave-traders in the setting as well. In-universe, this is highlighted as roughly being the equivalent of the difference between a pharmacy dispensing medicine with a valid prescription, and the way drug dealers operate.
* HerosSlaveHarem: One of the {{Trope Codifier}}s. When Diablo is summoned, his ring that deflects all magic reverses the slave spell that the two girls who summoned him had used and thus makes them ''his'' slave instead of the other way around. At first, no one is happy with the arrangement and look for ways of reversing the spell, but after Diablo shows himself to be a NiceGuy underneath his JerkassFacade, the girls fall in love with him. He acquires more girls later (some, though not all, being slaves as well).
* HumongousMecha: The pillar of Gelmudo's war-machine.
* ItMakesSenseInContext: Diablo describes his situation in the fourth novel thusly:
-->Like this, Diablo misrepresented himself as God for the sake of biscuit expenses and avoiding marriage.
* ImagineSpot: Diablo has a few where he pictures himself and other characters in scenarios set in his original world.
* ItAlwaysRainsAtFunerals: Three days after the Fallen's assault on the city, the funeral was held for all the adventurers that were killed by Grigore and appropriately enough, it was raining.
* KarmaHoudini: Despite having his plans foiled by Diablo, Chester faces no punishment for his more morally ambiguous actions.
* KilledOffForReal: In ''Cross Reverie'', the worst that can happen to a player when they are killed is a level-down penalty and a re-spawn at the last town they visited. In this world however, death is permanent. As such, very few people would be willing to risk their lives to fight stronger monsters. Diablo also concluded this is what contributed to the circulation of what he considers low quality spells, skills, and weapons as well as the promotion of the Summoner class since it is the easiest and safest class to learn as a sorcerer and allows a higher chance of surviving a quest.
* LanguageBarrier: Kobolds and most of the "mortal races" can't understand each other, at all. The kobolds sometimes trade with dwarves, [[FantasticRacism but humans treat them like wild beasts and try to drive them out of areas they settle and make towns in.]]
* LittleBitBeastly: Three of the six races: Dwarves have dog ears and tails; Pantherians have cat ears and tails; Grasswalkers have rabbit ears and tails. The more humanoid of the Fallen have animal traits as well, usually on the reptilian side.
* AMagicContractComesWithAKiss: The slavery ritual for summoned beasts.
* MagicIsMental: To cast spells, you have to think about what their game description describes, i.e. to cast <Explosion>, Takuma has to imagine "Gathering hydrogen from the surrounding air and igniting it with magic".
* MagikarpPower: Elemental mages are considered useless and pathetic, because they, like most people, avoid fighting whenever possible, so they never reach the point where they begin getting powerful spells.
* MarryThemAll: [[spoiler:Diablo marries both Rem and Shera in Volume 8 of the light novels. (Although, there is a little mix-up with the rings to where Rem had technically married Shera instead of Diablo that takes a couple more volumes to correct.)]]
* MediaTransmigration: Takuma Sakamoto is a [[{{Hikikomori}} shut-in]] GodlikeGamer who dominates the MMORPG called Cross Reverie as a character known as Diablo the Demon Lord. But then one day he gets sucked into a world resembling Cross Reverie, where he becomes his own overpowered player avatar Diablo.
* MenAreTheExpendableGender: Male antagonists are generally far less sympathetic than female antagonists, and far more likely to end up dead. In addition, there are very few male protagonists aside from Diablo himself.
* MetaGuy: By nature of being from the real world, Diablo is aware of game quirks, and constantly lampshades various game tropes or comments on how things work for him in the game versus the game world.
* MuggingTheMonster: Most of the antagonists go and provoke Diablo, or his companions, without knowing anything about them, finding out too late that they're way outclassed. It eventually segues into BullyingADragon and TooDumbToLive because people '''still''' go out of their way to provoke Diablo when his power, intelligence, competence, and tendency to brutally beat down people who threaten him and his companions becomes well known.
* NewLifeInAnotherWorldBonus: Diabolo possesses his MMORPG Cross Reverie's avatar granting him all of its abilities including his counter-stop level 150.
** His most used equipment being The Demon Lord's Ring, a drop from defeating the Demon Lord of the Mind, Enkvalos, working as an absolute AttackReflector against anything classified as magic. The only downside is that it also reflects positive magic cast on him such as healing and status buff spells.
* NoodleIncident: One thing the story never explained so far is how Rem and Shera both came to be at the Starfall Tower.
* OurDemonsAreDifferent: There are at least four classifications:
** Demon Lords: Absolute forces of evil that were separated into pieces and sealed away long ago.
*** While Diablo claims to be one himself (from another world), he's actually just performing a huge roleplay bluff.
** Demonic Beast: Monsters in the wild.
** Fallen: An intelligent race that is depicted as antagonistic to the six races and subservient to the Demon Lords.
** Demons: One of the six races. They look like humans with tattoo markings that are said to be descended from the Fallen.
* OverdrawnAtTheBloodBank: Played for some VERY dark laughs at the Adventurer's Guild. Instead of just signatures, the guild requires you to also sign your contract with blood, obtained via a knife. Diablo tries to cut slightly, ends up going to the bone, and [[HighPressureBlood spraying a poor guild clerk, the counter, the wall behind her, and over half of his contract with blood.]] In the next shot inside the Guildmaster's office, she's seen holding the contract, which is now soaked completely red from the bottom half.
* PragmaticAdaptation: The manga and anime adaptations omit, move, and alter some events from the light novels.
* ReadingsAreOffTheScale: There is a mirror that measures people's PowerLevels, measured by how much of your image you can clearly see in it. When Diablo tries it, he's too powerful, so it malfunctions and shuts down. In the anime, it's portrayed as causing the entire area around the guild to suddenly go dark after a bubble of red lightning-like streaks expands from the now pitch-black mirror.
* RPGMechanicsVerse: The world that Takuma was summoned to that is similar to the game ''Cross Reverie''. It has levels, skills, and other things from the game.
* SeparatedByACommonLanguage: The light novels and English anime sub use the British term "biscuit" to describe Klem's favorite food, whereas the English dub of the anime goes with the American term of "cookie".
* ShoutOut:
** There is a scene in Volume 6 where Diablo wishes he could [[LightNovel/ReZero Return by Death]].
** A [[PaletteSwap palette-swapped]] {{Expy}} of [[WebAnimation/{{hololive}} Usada Pekora]] appears as a [[https://www.youtube.com/watch?v=159MXyj2Rco background character]] in the original broadcast version of Season 2 Episode 2.
* SlaveCollar: Slaves and contracted summoned beasts wear magically conjured ones. It's an early plot point that both types are almost indistinguishable from each other, making people assume Rem and Shera were MadeASlave.
* SpaceCompression: Present in the game of ''Cross Reverie'', but ''not'' in the world versions. As a result, a distance that would take three minutes to walk in ''Cross Reverie'' takes three hours in real life.
* StandardFantasyRaces: In the ''Cross Reverie'' game there are six races players can choose from. In the other world, the six races are the main tribesmen that populate the world. The Races are:
** [[HumansAreAverage Humans]]
** [[OurDwarvesAreAllTheSame Dwarves]]: They have the addition of having dog ears and tails.
** [[OurElvesAreDifferent Elves]]: Pointy long ears, very commonly [[{{Elfeminate}} slender to the point of androgynous]].
*** Dark Elves: Similar to Elves but have darker skin. Females have giant breasts.
** Grasswalkers: Small childlike rabbit-eared and -tailed.
** Pantherians: Cat-eared and -tailed.
** [[OurDemonsAreDifferent Demons]]: Tattooed humanoids said to be descended from the Fallen. The game has them physically weaker, but they do have high INT.
* SummoningRitual: In both the ''Cross Reverie'' game and the world, <Summoners> get summoned beasts by going to <Starfall Tower> and performing a ritual then make a slavery ritual.
* SummonMagic: A magic system found in both ''Cross Reverie'' game and the world Takuma was summoned into. The game looks down on summoning, while the world favors it. The game considers it weak, while the world puts the safety of the <Summoner> in high regard.
* {{Teleportation}}: A magic both in ''Cross Reverie'' and the other world. In the game, it is a bit common. In the other world, it is mostly just rumors and not used by the masses.
* ThirstyDesert: Zirconia, the setting of Volume 4, is this. Alongside the dangerous sand whales, the lack of water, and state of the management at the only (relatively) safe settlement in the area, [[spoiler:Diablo's personal dungeon also ends up here.]]
* TooHotForTV: A variation; the first season of the anime was officially released for free on Youtube, but was taken down shortly afterwards because it was too sexy and broke some of the rules.
* TranslatorMicrobes: For some reason that is never explained, Diablo not only understands every word said to him, regardless of the language, but when he speaks back, his words are automatically translated into the language of the people he's addressing, in their minds. He cannot read nor write in any of the native languages, however.
* TrappedInAnotherWorld: Takuma was summoned in the first chapter as his ''Cross Reverie'' character Diablo.
* TraumaInn: Deconstructed. While the game of ''Cross Reverie'' has the mechanic, in the new world, when Diablo over-used his [=MP=], and suffered the proper loss of motivation, i.e. mental strength, the apathy didn't disappear despite him being cooped up in the inn for ten days. It took him seeing Shera in GoGoEnslavement to snap him out of it. The second time it happened it took Sylvie serving him a strong alcohol with MP restoring properties to get him going again but in a drunken stupor he mistook her for a body pillow, pulled her close, stripped her naked, brought her to orgasm, and fell asleep with her still naked and unable to break free of his grip.
* TuringTest: As is revealed in Volume 11, at the founding of the human kingdom, with LoadsAndLoadsOfRaces, humanity needed some "objective" method to tell the difference between sentient beings and animals. The method they chose? You can speak common, you're a sentient, even the Fallen. You can't, you're a "dumb" animal. Then the FantasticRacism sets in...
* UnequalRites: There are two main types of magic-user, summoners and elemental mages. Summoners are near useless in ''Cross Reverie'', while in the actual world elemental mages can barely do anything.
* YinYangBomb: When light and dark elemental energies clash, they don't just cancel each other out, as one would expect. They amplify each other's destructive power in a manner eerily similar to a matter-antimatter explosion. Diablo exploits this in Volume 10 to deal with the volume's BigBad.
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