History Literature / IveBeenKillingSlimesFor300YearsAndMaxedOutMyLevel

* LongTitle: Twelve words, if you write "Three Hundred" numerically. What's more, the English title is already shortened; a literal translation would have "Without Knowing It" added to the end.

*** "The stranger asking to see to a precious stone actually being your future self," which happens in [[spoiler:''VideoGame/DragonQuestV'']].

** In the afterword of volume 10 of the manga, Yuusuke Shiba remarks he's always liked it when a character [[ChekhovsGunman reappears later in the story when they didn't didn't seem like they'd show up again after the beginning]] and gives the following examples:

* ActorAllusion: In the anime, Goodly Godly Godness, the Goddess that reincarnated Azusa, who states she will look "17 years old, just the way I like it", is voiced by "eternally 17" Creator/KikukoInoue. In the original Light Novel, Azusa looked eternally 20, instead.

Starting life in 2016 as a WebNovel, the series was picked up by SB Creative in 2017 and distributed as a LightNovel series; beginning with Volume 5 in 2018, some of the novels have had special editions which come with Drama [=CDs=]. The same year the light novels began, a manga adaptation was published by Creator/SquareEnix for their online platform, [=GanGan=] Online, illustrated by Yuusuke Shiba (シバユウスケ). Official English translations of the novels and manga are produced by Yen Press, [[NoExportForYou though the novels don't come with the Drama CDs]]. An anime adaptation of the novels was announced in 2019, with the cast of the Drama [=CDs=] reprising their roles, and began airing in April 2021.

** An omake in Volume 10 of the manga has Goodly Godly Goddess talking about fads in reincarnation, like getting reborn as a noble, a monster, or a miserable character with "mega-super-OP" powers. All of these are common premises in ReincarnateInAnotherWorld stories.

* DidntThinkThisThrough: After Azusa finally gets the cure for the Gnome-Maker Mushroom which shrunk her, she eats them in Pecora's throne room to proudly grow back to normal in front of the others. And she's not suspicious on why Pecora is also encouraging that. Shalsha realizes that [[ShapeshiftingExcludesClothing her child sized clothes won't fit her anymore]].

* EntertainmentAboveTheirAge: Falfa and Shalsha, two mentally and physically eight year old slime spirits who regularly read books that adults would find tedious and/or challenging for fun. For example, during [[ButtMonkey Halkara's]] introductory chapter, they read a [[{{Doorstopper}} thick]] nonfiction volume about the military mistakes of an elven general that led to the severe weakening of his kingdom.
* ExtraordinaryWorldOrdinaryProblems: Azusa is often surprised about how similar concepts from her old life are also present in this fantasy world and compares them in her thoughts in the light novel. Including problems ranging from a musician leaving their home town and struggling to succeed, to corrupt goverment people or a declining town that can't get tourists.

* GratuitousEnglish: In Japan, the series has the English tagline ''She continued destroy slime for 300 years''. Creator/YenPress render it as ''She slaughtered slimes for 300 years'' instead.
* GreatGazoo: Goodly Godly Godness, the very being who reincarnated Azusa. She is later exiled to Azusa's world and causes no end of trouble for Azusa and family. Even more amusing in that the first couple of volumes of the Manga show Azusa having fond thoughts and memories about the "angel girl" who reincarnated her not knowing the later trouble she would get from the goddess.

** An omake in Volume 10 of the manga has Goodly Godly Godness talking about fads in reincarnation, like getting reborn as a noble, a monster, or a miserable character with "mega-super-OP" powers. All of these are common premises in ReincarnateInAnotherWorld stories.

* MeaningfulBackgroundEvent: During Halkara's story introduction, each scene taking place in Azusa's house has a single random fly periodically buzz around. Near the end of her introduction, it turns out that said fly was a shapeshifted Beelzebub, the person Halkara was running away from.

** When Azusa has to infiltrate the Vanzeld castle to help Pecora from their accident, Vania gives her a doctor disguise along with a demon horn headband and a fake tail. Azusa doubts they would work, but it helps that they run through the security checkpoints before they can take a closer look. Unfortunately they are caught right in front of Pecora's room which had tighter security.

* SliceOfLife: In spite of all the conflict and fights Azusa gets into, the majority of them end up being [[CurbStompBattle Curb-Stomp Battles]] to make more time for cute antics with her ever-growing number of students and adoptive family members. This is even noted by the publisher; the poster above has the headline "The Slow Life in ''Isekai'' Now Begins!"

* StockSoundEffects: After messing up and unintentionally transforming Azusa into a child, Halkara speeds off to find a cure, to the sound of the classic [[Creator/HannaBarbera Hanna-Barbera]] dash noise.

** In the slower paced LN, after Azusa defeated the adventurers she spends time studying about monsters to give people advice on how to combat strong creatures like Dragons, instead of fighting them herself. While also hoping her rumors would stop spreading among people. It’s at this point Laika the dragon knocks on her door.

* LeaningOnTheFourthWall: Early on in Beelzebub's spinoff, Pecora mentioned Beelzebub's long tenure as a bottom-tier bureaucrat is like "trying to be the strongest by killing nothing but slimes", or, otherwise, what Azusa accidentally did in the main story.

* {{Spinoff}}: Four as of January 2022, all of which are backstories of Azusa's family members: %% Titles for the latter two are sourced from the afterword in the Bottom-Tier Bureaucrat light novel.

** ''The Red-Dragon Academy for Girls'': A web novel about Laika's backstory.
** ''The White Journey of Margrave'': A web novel about [[spoiler: Shirona, a third slime daughter of Azusa,]] being trained magic by Magie.

* AsskickingEqualsAuthority: The Demons and both the Red and Blue Dragon factions all follow a "Might Makes Right" philosophy, their absolute leaders being the most fearsome of them all.

* ActorAllusion: In the anime, Goodly Godly Godness, the Goddess that reincarnated Azusa, who states she will look "17 years old, just the way I like it", is voiced by "eternally 17" Creator/KikukoInoue.

* ActorAllusion: In the anime, Goodly Godly Godness, the Goddess that reincarnated Azusa, who states she will look "17 years old, just the way I like it", is voiced by "eternally 17" Creator/KikukoInoue. In the original LightNovel, she was eternally 20.

* ActorAllusion: In the anime, Goodly Godly Godness, the Goddess that reincarnated Azusa, who states she will look "17 years old, just the way I like it", is voiced by "eternally 17" Creator/KikukoInoue.

* AnAesop: The show (and the novels beforehand) constantly harp on slowing down and making a work-life balance, leaning in hard against Japan's overwork culture. This moral is central to Azusa's very character and her relationship to the other characters, so it works where a more subtle moral would not.

* {{Spinoff}}: Three as of February 2020, all of which are backstories of Azusa's family members: %% Titles for the latter two are sourced from the afterword in the Bottom-Tier Bureaucrat light novel.

Starting life in 2016 as a WebNovel, the series was picked up by SB Creative in 2017 and distributed as a LightNovel series; beginning with Volume 5 in 2018, some of the novels have had special editions which come with Drama [=CDs=]. The same year the light novels began, a manga adaptation was published by Square Enix for their online platform, [=GanGan=] Online, illustrated by Yuusuke Shiba (シバユウスケ). Official English translations of the novels and manga are produced by Yen Press, [[NoExportForYou though the novels don't come with the Drama CDs]]. An anime adaptation of the novels was announced in 2019, with the cast of the Drama [=CDs=] reprising their roles, and began airing in April 2021.

You can view the first Japanese anime trailer [[https://www.youtube.com/watch?v=04BFCHXpBq8 here]].

On January 4th, 2022, it was announced the anime was renewed for a second season.

* {{Spinoff}}: Three as of February 2020, all of which are backstories of Azusa's family members:
** ''I Was a Bottom-Tier Bureaucrat for 1,500 Years, and the Demon King Made Me a Minister'': A web novel about Beelzebub's backstory, with a manga adaptation.
** ''The Elf's Dinner'': A web novel about Halkara's backstory.
** ''The Red Dragon Women's Academy'': A web novel about Laika's backstory.

* {{Foreshadowing}}: When Asuza's checking her level again in anime's first episode, there's a mug on the right table that's drawn like it's animated. Like there's someone there to interact with it and the characters. [[spoiler: Sure enough, when the scene's revisited, the shot pans right to reveal Ernest, a loose-lipped adventurer who blabs about how powerful Asuza's become.]]

* MusicalEpisode: Episode 10 is basically an excuse to have the entire cast show their singing skills.

The series tells the story of Azusa Aizawa, a regular Japanese salarywoman who finds herself dying from overwork at age 27. A merciful goddess takes pity on her, and offers her a new life in another world, where she's free to live the simple, carefree, and easy life Azusa has always wanted. She takes the offer, and finds herself an immortal witch in a medieval fantasy world.

* FantasticAesop: The aesop of the series is that overexertion and working too hard can cause you more harm than good, no matter what your job or superiors desire. However, the way the protagonist overcomes this problem is by being reborn as an immortal witch. Many characters join up with her in order to learn how to be as powerful or successful as she is, and they're all immortal and/or LongLived themselves and thus can afford to imitate her methods without the constraints of a normal human lifespan. Likewise, things like Levels that build stats don't exist in RealLife; people cannot gain immense physical power from, say, swatting 25 flies every day. This does not diminish the lesson the story is going for in any way, although its solutions cannot be easily translated into the real world.

''[[LongTitle I've Been Killing Slimes for 300 Years and Maxed Out My Level]]'' (''スライム倒して３００年、知らないうちにレベルＭＡＸになってました'', or ''Suraimu Taoshite Sanbyaku-nen, Shiranai Uchi ni Reberu Makkusu ni Nattemashita'') is a Japanese LightNovel series by Kisetsu Morita (森田季節), with illustrations by Benio.

''I've Been Killing Slimes for 300 Years and Maxed Out My Level'' (''スライム倒して３００年、知らないうちにレベルＭＡＸになってました'', or ''Suraimu Taoshite Sanbyaku-nen, Shiranai Uchi ni Reberu Makkusu ni Nattemashita'') is a Japanese LightNovel series by Kisetsu Morita (森田季節), with illustrations by Benio.