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Fanfic / Hero Academia DD

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Art done by knilzy95.

Hero Academia D×D (alternate link to Fanfiction Dot Net here) is an ongoing Fusion Fic of My Hero Academia/High School Dx D, with characters from other manga thrown in, where people with Quirks unknowingly live next to angels, fallen angels and devils, as well as people with strange abilities called Sacred Gears.

In this world, 80% of the population has a special ability, sometimes a superpower, called a Quirk. One young man by the name Midoriya Izuku wants to be a Pro Hero, a super-powered crimefighter, so he can save people with a smile and bring them hope in their time of need - much like his favorite hero, All Might.

The only problem? He's Quirkless, part of those who lack a Quirk. However, no amount of bullying or scorn is going to beat his desire to become a hero out of him.

A pretty girl he meets by pure chance tells him she can help him become a hero, in exchange of a date. Against his better judgement, Izuku agrees to it...


... and the girl, who turns out to be a fallen angel, kills him. In his death throes, Izuku makes one last wish: a chance to become a hero.

This catches the attention of Rias Gremory, a beautiful girl who just happens to be both a General Studies student at U.A. (Japan's most famous Hero School) and a Devil King. Moved by the intensity of Izuku's wish, as well as intrigued by his hidden power, she revives him by reincarnating him into a devil, as part of her Peerage.

This plunges Izuku into being part of two worlds, as he deals with villains from both sides of the masquerade while learning how to be a Hero... and dealing with the harem that he is unwittingly forming around himself.

That might as well be the hardest thing he can handle.


Hero Academia D×D provides examples of:

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     Tropes A-M 
  • Accidental Pervert: Izuku really, really didn't intend to check out Koneko and Ochako after their clothes get partially destroyed in the Rating Game.
  • Achievements in Ignorance: Much to everyone's amazement and confusion Celica somehow manages to get second place in the obstacle course. Without anyone noticing her or leaving the circuit at all.
  • Adaptation Relationship Overhaul: Izuku never has the chance to meet All Might, instead getting his powers due to his draconic inheritance, his Sacred Gear and his reincarnation as a devil. So, when they meet, he's just a star-struck fan.
  • Adaptational Badass: The characters tend to be more badass than their counterparts in both canons.
    • Izuku now has super strength, can fly and fire long-range attacks without breaking himself like his canon self, and add to that the versatility of the Pawn, that can give him powers akin to a Rook, Knight, Bishop or Queen. And, when All Might gives him One for All, it appears that, thanks to his previous training, he will be able to wield it much better than his canon self could at that point. Indeed, with Ddraig's help, he's able to figure out a way of using it that isn't all-or-nothing much sooner than in canon, though All Might advises him not to try combining it with the Boosted Gear's Boost ability yet.
    • Ibara improves from Asia in being able to use her vines to fight and learning defensive spells.
    • Momo, even before becoming a devil, can throw lightning around and use that to control magnetic fields an inheritance from her Fallen Angel father.
    • Ochako gets magical powers to complement her Quirk, as well as the powers of a Rook.
    • Even the USJ Nomu gets in on this. In canon, All Might was able to beat Nomu with around three-hundred rapid-fire punches. Here, it takes 500 hits to defeat, even though All Might still has One for All - which could be because the Nomu was once a Phenex Family member, giving him the inherent toughness of a pure-blood devil as well as a strong Healing Factor.
  • Adaptational Early Appearance:
    • Muscular appears during the USJ attack with the League.
    • Griselda Quarta joins Irina and Xenovia on their journey to Japan.
    • After losing her Excalibur, Irina uses Hauteclere in the fight at U.A., where canonically she didn't get it until well after she became an angel.
  • Adaptational Superpower Change:
    • Izuku, instead of One for All, has the Boosted Gear and, as the descendant of a dragon, can partially transform into one. All Might still offers it to him though, and after some deliberation, he eventually accepts after the fight with Kokabiel.
    • Ibara, apart from her vines, also has the ability to heal people thanks to Twilight Healing.
    • Momo can also control lightning, which she can use to control magnetic fields.
    • Ochako learns how to use magic in combination with her Gravity Master Quirk and supplements it with her Devil Rook powers.
    • Kiba has a Quirk that allows him to change his gravitational orientation, but only when walking on a surface (like a wall).
    • The Armed Detective Agency have Sacred Gears instead of Abilities, though said Sacred Gears are based on the Abilities they have in canon.
    • Rashomon is a Quirk now, and Higuchi has a Quirk that allows her to control the trajectory of her bullets, as well as a currently inactive Sacred Gear corresponding to her unknown canonical Ability.
  • Adapted Out:
  • Age Lift: Rias and the other D×D characters are all two years younger than in canon. For example, in canon, she was a third-year while Issei was a second-year when she reincarnated him. Here, she's a first-year high school student while Izuku is a third-year middle school student when she reincarnates him.
    • Hyde Kido was in his second year of high school in canon, but here he is Izuku's age.
  • Ain't No Rule: Basically Midnight's reaction to Izuku's trick of switching and inverting the headbands so the 10,000,000 point one is on Milia's neck and a second one is on her forehead, preventing anyone from realizing until it's too late.
  • Amazingly Embarrassing Parents: Both Izuku and Rias suffer from this.
    • Inko openly reminisces about her own "adventures" with her husband, is not shy about her Shipper on Deck and I Want Grandkids attitudes and punishes Izuku for not telling her about Rias' birthday by showing his friends his embarrassing childhood photos.
    • Venelana teases the hell out of her daughter about her attraction to Izuku, while Zeoticus makes no qualms about taking photos of his daughter while she's being embarrassed.
  • Awful Truth: Kokabiel revealing that God Is Dead in Chapter 31 is treated like this by pretty much everyone save Mizu, Griselda, and Akutagawa. The former two knew already (Mizu because all the Kamar-Taj graduates are told as a test, and Griselda because of Lailah) while Akutagawa just didn't believe in God to begin with.
  • Bad Powers, Good People: The Bael and, with Venelana marrying Zeoticus, Gremory families' Power of Destruction is a force that can destroy and decay anything it touches making users to gain monikers such as Flaxen-Haired Madame of Extinction or Crimson-Haired Princess of Ruin. At the same time, the Gremorys are known for treating their servants as members of their own family and are quite fair in their dealings.
  • Bedmate Reveal: Twice now, Izuku has woken up to find a naked girl in his bed. The first time is Rias, the second time is Rias, Ochako and Ibara.
  • Boring, but Practical: During the Cavalry Battle, instead of going for the 10 million headband, and end up dealing with whatever plan Izuku came up with, Liana decides to take the headbands from other teams and then stays away from the fighting the moment she has enough of them. This helps to put them in second place.
  • Breather Episode: In comparison to the Holy Sword Arc, the Sports Festival Arc should be this (combat heavy yet no true life-or-death scenarios).
  • Clingy Jealous Girl: The girls that like Izuku are not keen on any other girl approaching their boy. Case in point, when Izuku ends up in a team with Mei, Ibara and Milia, Rias and Ravel are close to go Yandere on the poor kid. And when Milia kisses him in the forehead, all the girls that like him (Hagakure, Ibara, Mina, Momo, Ochako, Ravel, Rias, Setsuna and Tsubasa) glare at her.
  • Clueless Chick Magnet: Izuku (much to his astonishment) is attracting pretty girls like honey attracts flies without even trying. By the time he starts attending U.A., three girls are keen on sleeping naked in his bed, six more are harboring crushes on him and, per Word of God, at least eleven more will eventually join in. According to Ddraig, girls find him instinctively more attractive than other boys because of his natural Nice Guy personality and the personal power he carries from his draconic ancestry and the Boosted Gear.
  • Combo Platter Powers: Several characters, in part because it's possible to have a Sacred Gear and a Quirk, and reincarnated Devils get their Quirk and/or Sacred Gear plus their devil abilities.
  • Composite Character: Several main characters are fused as part of the story.
    • The main character is Izuku with Issei's Boosted Gear, part of his backstory (becoming a devil after Raynare kills him) and penchant to somehow have all sorts of girls want to jump his bones.
    • Ibara takes Asia's Twilight Healing, backstory (a Catholic girl who, due to Twilight Healing, became a saint of sorts only to be excommunicated because she healed a devil) and hero-worship of the main character.
    • Momo gets Akeno's lightning, BDSM tendencies, and backstory as the daughter of a Fallen Angel she is estranged with.
    • Mineta gets Motohama's ability to get a girl's measurements by sight.
  • Color Failure: When Irina impulsively kisses Izuku when he comes to see her off at the airport, Rias, Ibara, Ochako, Ravel, and Momo all go white with shock.
    • When All Might reveals that he knows that the ORC members are devils, Izuku turns so pale that he looks like a corpse.
  • Contrived Coincidence: Out of all the students the electricity villain could have tried to use as a hostage, she picked Yura Tsubasa, who has a Quirk that allows her to turn herself non-conductive and absorb energy to use it.
  • Cool and Unusual Punishment: For not warning her about Rias' birthday party (even though he only found out the previous day), Inko punishes Izuku by... sharing all of the embarrassing photos she has of him with the rest of the peerage.
  • Covert Pervert:
    • Going by some of her comments, it seems like Inko was quite wild in her youth.
    • When Izuku lands on Milia's boobs and accidentally rubs his face on them, Milia admits (to herself) that she had fantasized that.
    • Momo has Akeno's Combat Sadomasochist traits, but she's just discovering them and is trying to hide them. She's also apparently slept with Kyoka already. When finishing Kiba's spanking punishment, she has to be stopped by the others because she got so into it that she lost count.
  • Curb-Stomp Battle: The Rating Game versus Riser Phenex and his Peerage. Thanks to their strategy, their powers and being underestimated, Rias' Peerage manages to destroy their rivals, with the only loss being Ibara when she takes a fire attack for Rias.
  • Crazy-Prepared: Nezu, after the USJ incident, secretly installed a separate security system completely independent from the main U.A. systems, which allows him to see a recording of the fight against Kokabiel.
    • During the Cavalry Battle, Ibara steals Rin's headband and Milia swaps it with the 10 million headband, placing it on her forehead while the real one is on around her neck, both turned around so no one can see their actual value. This proves beneficial when Todoroki steals the headband on Milia's forehead, preventing him and his team from realizing its value before it's too late.
  • Cuteness Overload: Rias when faced with Izuku's childhood photos.
  • Death by Adaptation: A hooded figure murders Kokabiel in Cocytus so that the Fallen can't reveal anything to his captors.
  • Dungeon Bypass: Lampshaded by Present Mic when Izuku manages to get past most of the Sports Festival's Obstacle Course by flying.
  • Eating the Eye Candy: Ibara, Ochako, and Rias are almost drooling at the sight of post-Training from Hell Izuku.
  • Enemy Mine: The Port Mafia and the Exorcists work with the devils to stop Kokabiel's plans.
  • Epic Fail:
    • When Ile and Nel (the chainsaw-wielding twins in Riser's Peerage) attack Izuku, their first attack ends up hitting the concrete walls: their chainsaws break and they hit themselves in the head. Their teammates can barely believe it, while Ochako thinks it's hilarious.
    • Ibara's first (and only) attempt to help with the cooking ended with her burning the eggs and the juice (somehow).
    • Momo's chocolate is so horrible that Izuku faints when he attempts to put a piece in his mouth (he doesn't even close his mouth before fainting), and even after over an hour of Twilight Healing, he can't taste anything for a week.
  • Everyone is a Super: In addition to roughly 80% percent of the human population having a Quirk of some kind, there's also magic in the form of spellcasting, Sacred Gears, etc., as well as the supernatural races like Devils.
  • Evil vs. Evil: The Port Mafia are far from heroes, but they want to stop Kokabiel from starting a war between the Three Powers, presumably to preserve their profits.
  • First Kiss: Between Izuku and Rias in Chapter 18. At least for Rias. Irina stole Izuku's when they were five while he was asleep.
  • Foreshadowing:
    • In Chapter 7, when Rias takes Izuku and Ibara to get their familiars, the Familiar Master initially Izuku as a potential dragon familiar, and Izuku feels a jolt of fear when he mentions Tiamat. He also has several draconic powers, namely a transformation that grants him dragon wings and scales, that Issei never got from the Boosted Gear. Come Chapter 16 and it's revealed that Izuku has dragon heritage.
    • In Chapter 23, there's a news report talking about a tiger in Yokohama. Bungou Stray Dogs fans will automatically know who said tiger is.
    • Lailah is first mentioned by All for One's doctor as having arrived back in the city in chapter 25. The next chapter has a woman with spider traits, revealed to be Lailah in chapter 29.
    • Early in the story, Rias mentions that All Might is also famous in the Underworld and that devils often try to recruit heroes. All Might reveals in Chapter 32 he knows about the ORC being Devils because he's been visited by so many devils he can spot them a mile away.
    • Chapter 35's big reveal, that Todoroki is a girl, gets much foreshadowing (post-Orwellian Retcon).
      • When getting ready for Battle Training, he is mentioned as waiting until the others are out to put on his costume, with All Might's internal monologue mentioning he knows that it is not because Todoroki is shy.
      • Aika reveals her ability, mentioning she knows how much the 11 1-A male students are packing downstairs when there are supposed to be 12.
      • Before the Quirkless sparring between Izuku and Todoroki, Mizu calls out Todoroki-channote  instead of -kun.
  • For Want of a Nail:
    • Due to having the Boosted Gear, Izuku scores first place in the U.A. Entrance Exam, while Bakugo only takes 5th place. Conversely, as Izuku didn't need help landing after taking out the Zero-Pointer, Ochako scores lower than in canon, taking 10th place.
    • Izuku makes more of an impression on Ravel Phenex - enough that she transfers to U.A. much sooner than she transferred to Kuoh Academy in High School D×D.
    • The Rating Game ends in victory for Rias' Peerage.
    • The USJ class trip involves Classes 1-A and 1-B instead of just 1-A.
    • The fourth and fifth Japanese Heroes are Liana's parents, Zero and Guren, which displaces everyone in the canon list from Best Jeanist down.
    • Only 32 students make it past the Obstacle Course instead of 42. Due to this, Aoyama, Hagakure, Mineta and Sero don't make it to the Cavalry Battle.
    • Ibara and Milia take Ochako's (who teams up with Liana, Shinso and Itsuka) and Tokoyami's (who is instead with Kaminari, Tetsutetsu and Honenuki) places in Izuku's team. Tsuyu takes Sero's place in Bakugo's team, while Kyoka replaces Kaminari in Todoroki's team.
      • As a result of the Battle, Kaminari, Tetsutetsu and Tokoyami don't reach the final round, while Sero fell in the Obstacle Course. They are replaced by Kyoka, Milia, Liana and Tsuyu.
  • Funbag Airbag: When Tsuyu throws them both into the boat at USJ, Izuku lands face first into Milia's bust.
  • Get A Hold Of Yourself Man: Izuku does this to Rias when she nearly falls through the Despair Event Horizon during the battle with Kokabiel after he confirms God Is Dead.
  • God Is Dead: Kokabiel confirms this in Chapter 31.
  • Godzilla Threshold: Kokabiel's attack on U.A. is a big enough threat that Momo contacts Sirzechs and Mizu calls in the Sorcerer Supreme - not that they arrive on time to make a difference.
  • Got Me Doing It: Rias starts picking up some of Izuku's habits, like mumbling and taking notes, over time.
  • Great Offscreen War: The Second European War, which Griselda fought in. Lailah fought in it as well.
  • Henpecked Husband: Only one meeting with Sirzechs and all of Rias' Peerage knows who is the one in charge in his household. Similarly, Zeoticus Gremory is well under his wife Venelana's thumb.
  • Heroic BSoD: Played for Laughs after Rias kisses Izuku. That night, Ddraig's attempts to call his attention are fruitless because Izuku's mind is on a loop over the kiss. As the story puts it, "It appears that an error has occurred with MidoriyaIzuku.EXE."
    • Irina kissing him for a full minute leaves him so out of it that he comes to an hour later in his bed.
  • Heroic RRoD: Because Quirks are biological functions, there are set limits as to how much an individual can use them. Aoyama Yuga is noted to be the most extreme example, only being able to use his Quirk, Navel Laser, for one-second before causing internal distress, though just like muscle overcompensation, this is mitigated by constant use and training.
  • Hidden in Plain Sight: Due to the advent of Quirks, the supernatural has been interacting with the mortal realm more openly as any oddities can simply be dismissed as a Quirk. The only individuals who would have to worry about breaking the masquerade is those who have both Quirks and Sacred Gears, or some other supernatural power, like Momo's lightning, and even then Momo passing her power off as a second Quirk being believed by the ORC implies that such excuses aren't uncommon.
  • Humans Are the Real Monsters: Some humans, like Freed, are able to match and even exceed the worst evils of the supernatural races.
    • Valper even lampshades this, saying that Michael is more human than he ever will be.
  • Hypocrite: Riser calls Izuku a selfish brat for interfering in the arranged marriage between him and Rias - when he's only trying to force the wedding through to stroke his ego and turn Rias into his Trophy Wife and her Peerage into his slaves, normal (Kiba and Izuku) or otherwise (Koneko, Ibara, Momo and Ochako).
    • Valper lampshades the hypocrisy of the Church in how they banished him for his research, but still ended up using the results to make Holy Sword wielders, although he admits that Michael probably didn't kill anyone to do so like he did.
  • Hypocritical Humor: When Griselda meets Mizu and Midnight, she says of the latter (after she leaves) that her attire is scandalous. Mizu points out that Griselda's not that much better.
  • In Spite of a Nail: In spite of the changes brought by the fusion of universes, there are still things that don't change.
    • The plot is kickstarted when Raynare attempts to kill the Boosted Gear holder before he discovers his true potential, and him getting resurrected by Rias.
    • The first arc is about Raynare's plot to steal Twilight Healing and Izuku's attempts to prevent it.
    • Riser Phenex forces the issue of his Arranged Marriage with Rias, prompting the Rating Game arc.
    • The Entrance Exam ends with Izuku destroying the Zero Pointer to save a trapped Ochako.
    • The USJ Battle still happens, only with Class 1-B also getting involved, the early appearance of Muscular and the Nomu being more powerful.
    • The Excalibur Arc still follows the same plot, save for the intervention of the Port Mafia and the early appearance of Griselda Quarta.
  • Innocent Cohabitation: Ibara, Ochako and Rias end up living with the Midoriyas for diverse motives. Of course, the three girls would really prefer it to be less innocent, and are not shy about showing Izuku how much.
  • Instantly Proven Wrong: Nezu calls Rias, Sona and Kudelia to his office. Kudelia wonders if he's onto them, but Sona replies that it's probably something involving their clubs. When they enter, Nezu shows them the video of the fight with Kokabiel. Kudelia sarcastically repeats Sona's comment.
  • Internal Reveal: Kokabiel reveals to the Peerage that Momo is the daughter of Fallen Angel Baraqiel, something only Kyoka and her family knew.
  • Kansas City Shuffle: One of the traps Yuuto sets up during the Rating Game is to get Riser's pawns to trigger one they can easily avert so they drop their guard and then trigger another that leaves them completely defenseless.
  • Lamarck Was Right: Lampshaded in regards to Izuku being part dragon on his father's side, since his father has a fire breath Quirk.
  • Laxative Prank: When Riser visits Rias as part of his attempt to force her to marry him, Momo slips enough laxatives into his cup of tea to last him for two days. They begin to take effect just before he leaves.
  • Lethal Chef: Unlike Asia or Akeno, Ibara and Momo aren't very good cooks. Ibara once burned juice and added vinegar to chocolate for some reason, while Momo's cooking is Chie and Yukiko levels of dangerous!
  • Luminescent Blush: This being Izuku, mixed in with the world of buxom beauties that is High School D×D, the result is the poor kid going red with regularity.
  • Marshmallow Hell: After their first day at U.A., Rias decides to demonstrate how close she and Izuku are by burying his head into her bosom.
  • Massive Multiplayer Crossover: One of the tags of the story reads "My Hero Academia and High School D×D are the main series". Sure enough, while the plot follows the canons of My Hero Academia and High School D×D, characters from Bungo Stray Dogs, Under Night In-Birth, BlazBlue and other series appear occasionally.
  • Megaton Punch: Izuku's finisher move, Dragon Smash. He uses it against Riser to end him during the Rating Game, and again to break Kokabiel's nose.
  • Mom Looks Like a Sister: When he meets Venelana Gremory (Rias' mother) Izuku thinks she is her sister, much to Venelana's amusement.
  • Mythology Gag:
    • The first meeting between Izuku and Ochako is him tripping and her using her Quirk to help him.
    • Izuku and the others meeting with Dazai and Kunikida is a rehash of how the two met Atsushi in canon.
    • Riser is defeated when the Boosted Gear holder drenches him in Boosted holy water and gives him a Megaton Punch with a hand holding a cross.
    • Yura Tsubasa stating she likes boys unafraid of getting dirty.
    • Rias' father originally wanted her to go to Kuoh Academy, which is where she and Sona studied in canon.
    • Koneko calls Ravel "fried chicken".
    • As seen in Naked Apron, the girls in Izuku's harem surprise him by welcoming him home only wearing an apron.
    • When Rias was note taking after his reaction with the cheer-leading outfits she also wrote down "pole dancing" (Ending 1) and "belly dancing" (OVA 2) as additional ways to tease Izuku.

     Tropes N-Z 
  • Naked Apron: In Chapter 30, Ochako and Ibara do this, on Aika's advice, when Izuku gets home. And then Rias joins them...
  • No-Sell: Anti-Quirk effects like Eraserhead's Quirk don't have any effect on supernatural abilities or Sacred Gears, and vice-versa.
  • No Sense of Direction: Celica is so completely hopeless with directions that she managed to get second place in the Sports Festival Obstacle Course without knowing remotely how she got there.
  • No Sense of Personal Space: Mei Hatsume, who chooses to put her face right in front of Izuku when she asks to join his Cavalry team.
  • Not What It Looks Like: When Rias finds Izuku in the same room as Setsuna, he has a hard time trying to explain that he didn't do anything.
  • Oblivious to Love: Izuku is the only one in his middle school class that cannot tell that Milia Takamaki is nursing a big crush on him. He begins to take the hint when he gets to U.A., though. He's also unaware of how deep his feelings for Rias run.
  • Oh, Crap!:
    • Izuku when he notices the many Death Glares he's getting from his male middle school classmates as Rias Gremory escorts him to the school.
    • Ibara and Izuku when Dazai and Kunikida reveal they are investigating the murder scene they were at.
    • Mizu when Nezu shows her a recording of the fight with Kokabiel.
    • Irina when Rias asks her if she was serious about stealing Izuku's First Kiss.
    • Izuku, as well as Kudelia, Rias, and Sona all have this reaction when they find out from All Might and Nezu, respectively, that they two know that they are Devils.
  • Ocular Gushers: Inko doesn't even try and argue when Mitsuki says that she and Izuku can literally cry up a river.
  • Orwellian Retcon: When the author changes an important plot point, he is not afraid of going back and modifying several scenes to fit with the change. The first time was with Momo no longer being the one to inherit One for All, the second was having Shoto be a girl.
  • Only the Pure of Heart: Hauteclere can only be touched by those with a pure heart, which makes Izuku grabbing the blade and returning it to Irina after defeating Kokabiel significant.
  • Parental Sexuality Squick: Izuku seems ready to find some Brain Bleach every time Inko mentions some of her adventures with Hisashi.
  • Pervert Revenge Mode: When Mineta leans his head on Tsuyu's bosom, Tsuyu grabs him with her tongue and slams him against the boat floor.
    • During the Obstacle Course, Mineta tries to use his Quirk to stick himself to Momo in order to reach the end of the race and grope her. Kido "accidentally" hits him with his sword while he is mid-air, knocking him back and leaving him to the (nonexistent) mercies of the Robo Inferno.
  • Polyamory: What the story aims for, with Izuku in the middle of a group of MANY girls that want him. As of Chapter 31, the official list (which the author has admitted is incomplete) includes:
    • From High School D×D: Rias Gremory (main girl), Toujou Koneko, Ravel Phenex, Yura Tsubasa, Xenovia Quarta, Shidou Irina, Toujou Kuroka, Rossweisse and Le Fay Pendragon.
    • From My Hero Academia:
      • Class 1-A: Uraraka Ochako, Yaoyorozu Momo, Jiro Kyoka, Asui Tsuyu, Ashido Mina and Hagakure Toru.
      • Class 1-B: Shiozaki Ibara, Kendo Itsuka, Kodai Yui and Tokage Setsuna.
      • Others: Melissa Shield, Hatsume Mei and Hadou Nejire.
    • Original Characters: Milia Takamaki and Liana Kozuki.
    • It's implied that this is the case with the Pro Hero Zero, since Liana has an older half-sister at UA, and given how many girls Lelouch had interested in him in his own series...
  • Refusal of the Call: Mirio Togata chooses not to accept One for All, as he wants to become a hero on his own terms. This leads All Might to choose Izuku instead.
  • Retcon: Originally, Momo was the one All Might chose as his successor, but per Word of God she would eventually have already three power sets (a Quirk, Fallen Angel powers and Devil Queen powers), so it was retconned, an Orwellian Retcon. Something similar happened after The Reveal that Todoroki is female.
  • Saying Too Much: When Izuku, Ibara, Kyoka, Momo, and Ochako meet Dazai and Kunikida and they mention last night's murder, Ibara accidentally reveals she and Izuku were there when she mentions the priest that carried out the murder - a detail the detectives had not mentioned to the teens.
  • Secret Secret-Keeper: All Might reveals in chapter 32 that he knows nearly all the Occult Research Club members are devils, as he's been the target of attempted recruitment multiple times and can tell the signs.
  • Shout-Out:
  • Story Arc: As a Fusion Fic between both worlds with a few extras, the story changes over between one and the other:
    • Chapters 1-6 is the Diabolos of the Old School Building Arc (Raynare and Ibara Arc)
    • Chapters 7-14 is the Entrance Exam Arc
    • Chapters 15-18 is the Phoenix of the Battle School Arc (Riser Phenex Rating Game Arc)
    • Chapters 19-25 are from Quirk Apprehension Test to the USJ Arc
    • Chapters 26-31 is the Excalibur of the Moonlit Schoolyard Arc (Excalibur/Holy Sword Arc)
    • Chapters 32-?? is the Sports Festival Arc
  • Spanner in the Works: Ibara sneaking a vial of holy water and a cross into the Rating Game proves vital for Izuku's plan to defeat Riser by exploiting devil's weaknesses to both, making him lose his regenerative power at a vital point.
  • Spared by the Adaptation:
    • Rias, after asking for Izuku and Ibara's opinion, spares Raynare here. She then joins up with the Port Mafia.
    • Mittelt was spying on Raynare for Azazel here, so she leaves Raynare's group before Rias takes them out.
  • Spider People: Lailah is a sadistic angel woman whose Quirk gives her spider abilities and traits.
  • Superior Successor: Izuku is shaping up to be this to All Might, which the latter even lampshades.
  • Supreme Chef: Rias, much like in canon.
  • Taking the Bullet: Ibara has done this twice already in the story: the first to save Izuku from being impaled by one of Raynare's light spears and the second to protect Rias from Riser's attack.
  • The Talk: After seeing Izuku sleeping in the same bed as naked Rias, Ochako, and Ibara, Inko insists on giving her son a crash sex-education course. Izuku is left pale and scared at how graphic his mother goes.
  • The Tease: Rias loves to tease Izuku, because she likes his reactions to it and because she likes him.
  • Training from Hell: To prepare for the Rating Game, Mizu calls in a favor from Tannin, the Devil Dragon, who takes Izuku to another dimension where Izuku essentially suffers through one month of torture to become a stronger fighter.
  • Underestimating Badassery: Riser makes the mistake of thinking Rias' Peerage will be unable to defeat him, being particularly insulting towards Izuku. During the Rating Game, Izuku destroys Riser in a personal fight.
  • Uneven Hybrid: Izuku has dragon ancestry.
  • Wham Episode:
    • Chapter 25. Izuku achieves Balance Breaker, All Might is planning to give One for All to Izuku, the League of Villains is aware of the hidden world, the Nomu may have been a member of the Phenex Family, and Irina and Xenovia enter the story just as they are assigned the mission to find the stolen Excalibur swords.
    • Chapter 29 reveals that, not only is Lailah an angel who's using a loophole to avoid Falling despite being an unrepentant murderer who wants a new war between the three powers, but her spider abilities and traits are from a Quirk despite angels normally lacking them, strongly implying a connection between her and All For One.
    • Chapter 31. The fact that God Is Dead is revealed to the heroes, as is Momo's heritage as a half-Fallen, Xenovia joins Rias's peerage in response to said Awful Truth, Nezu reveals to Mizu that he has footage of the fight with Kokabiel, Irina kisses Izuku at the airport when he comes to see her off, Izuku decides to accept One For All in response to the White Dragon Emperor appearing and taking Kokabiel down with ease, and finally, someone kills Kokabiel in Cocytus rather than risk him revealing their participation in the whole mess to the Fallen's interrogators.
    • Chapter 35. Todoroki confirms that she's a girl after a Freudian Slip.
  • Wham Shot:
    • When the Nomu's injuries regenerate, they do so by flaming up - just like the members of the Phenex Family.
    • Bakugo accidentally finds Freed Sellzen while he kills a priest.
  • Where Does He Get All Those Wonderful Toys?: Multiple times during the Sports Festival various students wonder how U.A. affords/makes stuff like the Zero Pointers and Obstacle Course.
  • Xanatos Gambit: Izuku defeats Riser by planning for several contingencies, bringing out the next plan when one fails to do the deed, until Riser is just unable to react.
    • First, he uses Flame Delete to nullify Riser's fires: this ensures that his injuries cannot regenerate so easily.
    • Then, Izuku gets closer, only for Riser to grab him and attempt to throw him off the floor, so Izuku just pulls him down with him.
    • Furious, Riser tries to choke Izuku, threatening to kill him if Rias does not surrender, but Izuku tells Rias not to give up and pulls out Ibara's holy water bottle, which, combined with a Boost, is more than enough to seriously incapacitate Riser after he's drenched in the water. This weakens him enough that his attacks lose a lot of power, allowing Izuku to wrap Ibara's cross around his dragon gauntlet and Dragon Smash him to kingdom come.
  • Year Inside, Hour Outside: The dimension Tannin trains Izuku in is stated to go one hour outside-one month inside.
  • You Have Outlived Your Usefulness: Someone murders Kokabiel in Cocytus as a precaution against anyone getting information out of him about their involvement in things.


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