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Fanfic / A Breach of Trust

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This is a world in which Mob and Reigen's paths have never crossed, in which 10-year-old Mob found psychic guidance in the form of the aging, retired tv personality Keiji Mogami, in which Reigen followed through on his plans to close the Spirits and Such Agency, in which a cruel twist of Mob's powers forces him to confront how dangerous he really is.

10 year old Shigeo Kageyama has vanished, his trail instantly cold, and his case gathers dust in police archives as a kidnapping never solved. Four years pass before a chain of events causes his path to cross with that of the despondent, unfulfilled fake-psychic-turned-fake-investigator, Arataka Reigen. Reigen finds himself in over his head caring for an escaped victim of abuse who, for reasons unfathomable, has been taught to believe his very existence is a horrifically dangerous thing…
— The fic's summary.

A Mob Psycho 100 Alternate Universe Fic by phantomrose96.

It features Mob and Reigen under drastically changed circumstances - Mob never came to Reigen for advice that fateful day. Instead, he's the victim of a four-year-long kidnapping and Reigen has become a private investigator for hire well on his way to becoming jaded with his line of work. That is, until a client walks in, asking him to tail her husband for fear of an affair...

It can be read here.


This fic provides examples of:

  • After-Action Patch-Up: A non-romantic version between Ritsu and Teruki makes up the entirety of chapter 17, though it's less about fixing the injuries and more about covering them.
  • Bare-Handed Blade Block: In an attempt to stop Mogami from cutting Tetsuo's throat, Reigen grabs hold of the blade. While he succeeds, it does give him some nasty cuts on his fingers and palm as a result.
  • Big Brother Worship: As with canon, Ritsu looks up to Mob, despite not having seen him in four years. He explicitly refers to Mob as 'the strongest esper', not that he knows many for comparisonnote .
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  • Break the Cutie: Essentially the basis of the entire fic - Mob goes from a cute and cheerful ten-year-old to a broken fourteen-year-old who's terrified to get close to anyone for fear of hurting or killing them by accident.
  • The Cameo: Tsubomi makes a silent cameo at the market when Reigen asks her mom for advice on hair management.
  • Casual Danger Dialog: Teruki keeps this up through the entire fight with Ritsu. For example...
    Teruki: [having just slammed Ritsu into the goalpost of a soccer goal from across the length of the field] That's a shame. I usually score with those shots.
  • Creepy Basement: Mob's kept in the basement of Mogami's house, which qualifies as this because of the whole 'basement of a condemned house with a 25-years-dead corpse strung up in one of the rooms' thing.
  • Curb-Stomp Battle: Teruki vs. Ritsu very rapidly turns into something between this and No-Holds-Barred Beatdown, with Ritsu inflicting only minor injuries on Teruki while ending up with a whole laundry list of his own injuries due to lacking a barrier or any real experience with using his powers for combat.
  • Demonic Possession: More like Evil Spirit Possession, but Mogami's possession of Tetsuo counts. He's doing it to buy food and other supplies for Mob.
  • Dramatic Dislocation: Ritsu dislocates his shoulder partway through the fight with Teruki as a result of accidentally grabbing his tie. Teruki pops it back into place for him after the fight using his psychic powers.
  • Dramatic Irony: Mob tells Reigen his apartment is much better than his 'Shishou's' house, and Reigen thinks of Mogami's house as a comparison - without realizing that that's exactly the place Mob is referring to.
  • Eerie Pale-Skinned Brunette: Mob, as a result of four years in the basement where the only window's a slit high up on the wall. Might even classify as Looks Like Cesare.
  • Evil Mentor: Mogami. He convinces Mob that he's dangerous and preys on his trust (you could even say he breaches it) to lock him in his basement... could you really call him anything else?
  • Fairy Tale Motifs: The first Act of Mob being kidnapped by an abusive caregiver who forces him to stay in the house while having him grow out his hair is fairly similar to Rapunzel.
  • Fingore: Reigen ends up cutting the fingers and palm of his right hand open while trying to keep Mogami from cutting Tetsuo's throat.
  • Hope Spot: Chapter 5 ends with Reigen hearing noises from the basement... and doing nothing about them, as he has other things to deal with. Had he investigated the noises, he'd have found Mob a lot sooner.
  • "Instant Death" Radius: Mob's barrier functions this way, shredding any and all organic matter that tries to pass through it.
    • Mogami's got a much more potent one around his corpse hanging in the attic
  • I Surrender, Suckers: Ritsu attempts to pull this during his fight with Teruki, only for the literal sucker punch to fail miserably.
  • Important Haircut: In Chapter 26, Mob allows Reigen to cut his hair stating that he wants to make an effort to change his old self and get stronger. This results in him trading his Rapunzel Hair for his trademark bowl-cut.
  • Jerkass Has a Point: Chapter 25 has Teruki coldly questioning Ritsu if his plan of having the spirits send him to places with more dangerous spirits will get him anywhere close to finding his lost brother.
  • Messy Hair: As a result of barrier-related trauma, Mob hasn't intentionally cut his hair in years. It's described in-story as being just below shoulder-length, though in fanart it can be wildly exaggerated until it more closely resembles Rapunzel Hair. It's messy enough that Mob can't get it properly clean, even once he has access to shampoo to use on it.
  • Mistaken for Cheating: Jun initially hires Reigen to investigate Tetsuo, her husband, for fear that he's cheating on her as his behaviour's taken a turn for the worse. It turns out he was 'just' possessed, as opposed to sleeping with another woman.
  • Mood Whiplash: Most of Chapter 23 focuses on Reigen celebrating his birthday with Mob as they go out for delicious ramen and even agree to reopen the Spirits and Such business as a master and psy-kick duo. But when Reigen is preparing the cake to end such a fun night, he goes into shock when he figures out that Mob's shinshou was none other than Mogami.
  • Must Have Caffeine: To avoid having to sleep - which reminds him too much of when Mogami was in control - Tetsuo turns to a constant supply of coffee to try and keep himself awake.
  • Original Character: Jun and Tetsuo Isari and Officer Isa Maki, as well as the background police officers and Dr. Wong.
  • Out of Focus: Isa Maki, who plays a supporting role in Act 1, has not had a point-of-view section since early Act 2. She returns in Act 3's chapter 23.
  • Poor Communication Kills: Much of the tension of the plot arises from the fact that Tetsuo has no idea Reigen's currently pseudo-adopted the very same boy that's the subject of his own case. Additionally, Reigen has no idea that Mob's "Shishou" was actually Mogami and that Mob's barrier isn't a delusion. Further, Mob thinks Mogami and Reigen were friends, due to hearing Reigen's voice through the basement door, as is worried about how Reigen will react to learning Mob "killed" him... Not knowing that Reigen is actually the reason Mogami disappeared.
  • Power Incontinence: To an even more severe degree than in canon - Mob's barrier is uncontrollable and shreds anything living that tries to pass through it. He can't consciously turn it off, and it's unclear what actually deactivates it.
  • Private Detective: After an incident involving a possessed client with a knife, Reigen closes Spirits and Such and re-opens it as a private detective agency, following through on plans mentioned - but not ultimately followed - in canon.
  • Realistic Diction Is Unrealistic: Reigen in particular is prone to interrupting himself, backpedaling, and going off on slight tangents, especially when caught off-guard.
  • Rugged Scar: Reigen has one on his cheek, as a result of a confrontation with a possessed, knife-wielding client. He closed Spirits and Such the day after.
  • Strict Parents Make Sneaky Kids: After losing their son, Mr. and Mrs. Kageyama are stricter with letting Ritsu do anything outside of the house in fear of losing him. But once he awakens his psychic powers, he begins to sneak out and create elaborate lies in order to use his powers, and supernatural allies, to look for Shigeo.
  • Take Me Instead: In an attempt to make Mogami stop possessing Tetsuo, Reigen offers himself as an alternative on the condition that Reigen gets to make one last attempt at attacking him. Luckily for him, that attack succeeds.
  • Took a Level in Cynic: After closing the Spirits and Such business and running a PI service for the last four years, Reigen has become more bitter and depressed with the dull, repetitive and bleak cases he takes on.
  • Unfamiliar Ceiling: Waking up after his first night at Reigen's place leaves Mob bewildered by the softness of his bedding before he realises where he is.
  • Wham Episode:
    • Chapter 9, where Mob escapes Mogami's house and runs into Reigen.
    • Chapter 12, which starts Ritsu's plot line with the spirit hoard.
    • Chapters 14-16 introduces Teru and has him and Ritsu get into a long, ugly fight. Often forgotten in this commotion is the chapter 15 reveal that Jun might be pregnant.
    • Chapter 23, where Reigen learns that Mob had been kidnapped by Mogami and held in his basement, meaning he inadvertently left him there twice. He also learns Mob thinks that he and Mogami are friends because of this. All on Reigen's birthday, no less!
  • Your Mind Makes It Real: It's heavily implied that Mob's barrier is only the "Instant Death" Radius it is because Mogami told him it would be. Mogami also uses this to check whether or not Reigen's bluffing about being a psychic, by telling him his own powers will burn him when Mogami approaches.
    Mogami: Psychics are impressionable. Psychics will manifest the powers they’re led to believe they have. All I had to do was tell you that your powers would burn you, and if you believed me, you would burn.

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