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Manga / The Dangers in My Heart

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I'm messed up...
Ichikawa, Chapter 1

The Dangers in My Heart (Boku no Kokoro no Yabai Yatsu) is a shonen romantic comedy manga by Norio Sakurai, who previously created Mitsudomoe. It began serialization in 2018 in Weekly Shonen Champion, later moving to Champion Cross a month into publication, and moving again to Manga Cross after the website merged with Champion. It was nominated for the 2020 Manga Taisho Award, and later licensed in English by Seven Seas Entertainment.

Kyōtarō Ichikawa is utterly convinced he is the tortured main character of a "fearsome psycho-thriller" centering on "the dark side of adolescence." A recluse and isolated from the rest of his classmates he spends his days fantasizing about ways to destroy the peaceful junior high life his classmates share. Surely this is a tale of a person at the very bottom caste of his school, who hides murderous impulses that lurk at the very bottom of his soul.



Not really. In actuality, this piece of work is a ridiculously sweet Rom Com about Ichikawa trying to maintain the peace (while still claiming he is a being of evil), and Yamada Anna, his class' idol who actually is a bit strange herself.

Think The End of the F***ing World meets Teasing Master Takagi-san, and you've got The Dangers in My Heart.

An anime adaptation was announced on August 1st, 2022 for a prospective 2023 broadcast.


The Dangers in My Heart provides examples of:

  • Accidental Pervert: Discussed when Adachi feels the need to ask an editor for Akita Shoten to what degree lucky lecher moments have a basis in reality during a class trip. Kyōtarō also has his fair share of inadvertently finding himself creeping on Anna, but its implied Anna is every bit as self conscious about her own attraction to Kyōtarō.
  • All Men Are Perverts: Kyōtarō has an especial hatred for some of his male classmates (especially Adachi) because they're constantly making crude sexual observations of Anna and her friends.
    • Adachi is pretty much disliked by Anna's friends because of his tendency to talk about sexual things at inappropriate times, though Anna herself is at least polite about it. He has such a poor understanding of when it is or isn't appropriate to talk about such things that he even asks a manga editor about lewd images in manga (asking if artists get themselves into those situations for research purposes) and openly drools over a swimsuit idol when he happens to see a poster of her in the manga studio. When Anna mentions she and said idol are acquainted, he rattles off details about her, pretty much disgusting all the girls present. He only realises his blunder when he notices the Death Glare everyone is shooting at him.
  • Amazingly Embarrassing Parents: Kyōtarō has this opinion about his mother when she comes to school for a parent-teacher meet. He's especially horrified when it turns out his mother is sitting right next to Anna and her much more glamorous mother while waiting for him.
  • Armour-Piercing Question: In Chapter 63, Anna admits to Kyōtarō that she constantly worries she's making her friends upset, and that they just aren't telling her out of politeness. Kyōtarō tries to reassure her that he's not like that, and that he'd have no problem speaking up and being brutally honest with her if she ever did something he didn't like. Anna then asks him why he started avoiding her in the days leading up to the winter break, and whether it was really just because he was busy like he said. Kyōtarō, who had been giving her the silent treatment over a misunderstanding, then lied about it afterwards to avoid hurting her feelings, is caught completely off guard and can only apologise and confess he's not as strong as he makes himself out to be.
  • Bait-and-Switch: On several occasions Anna has forced a sweet into Kyōtarō's hand, only to reveal it's just the wrapper and Kyōtarō realises she expects him to throw it away for her.
  • Beauty Is Never Tarnished: Averted and Played for Drama when Yamada gets hit in the face with a basketball, fracturing her nose. She spends a few chapters with a nose plaster, with the person who threw the ball feeling super guilty that the injury is interfering with her modeling job.
  • Big Eater: Anna loves to eat, often asking for (and getting!) extra portions for mealtimes. She also loves snacking on sweets and candy, and part of the reason she and Kyōtarō start getting closer is because she spends quite a bit of time in the library secretly snacking while he goes there to read.
  • Blatant Lies: In Chapter 1, Chii accuses Anna of sneaking off to eat snacks. Anna denies this, despite crumbs all around her mouth.
  • Chuunibyou: Kyōtarō has this bad, often having "dark" thoughts about his classmates and life in general. Justified because he actually is a middle school student.
  • Clingy Jealous Girl:
    • Anna sometimes shows shades of this where Kyōtarō is concerned. In Chapter 31 when her friend Moe unwittingly interferes with her attempt to get his contact details and then gets his details herself, Anna shoots her a terrible Death Glare.
    • Likewise, in Chapter 35 when her best friend Chii asks Kyōtarō to teach her science, Anna sits with them looking hugely annoyed. When Chii accuses her of secretly improving her grades by asking Kyōtarō to teach her, Anna sourly notes that he's never taught her anything. Later on when Chii leans toward Kyōtarō, Anna takes hold of Chii's shoulders and gently pulls her away.
    • In Chapter 72, Moeko gives out handmade chocolates to all the boys in her class. Anna grumpily eats the last one just to make sure Kyōtarō doesn't get it.
  • Cram School: Kyōtarō mentions he attends one.
  • A Date with Rosie Palms: There have been a few gags that imply that interacting with Anna somehow turned Kyōtarō on to the point he has to "relieve" himself in the toilet.
  • Death Glare: Kyōtarō often has one as he listens in on the shenanigans that go on in class.
    • Anna gives an epic one in Chapter 31 when her friend Moeko unwittingly prevents her to get Kyōtarō's contact details and then gets those details herself. The glare is so powerful Kyōtarō is taken aback. She demonstrates it again in Chapter 68 when Moe pulls off a Boyfriend Bluff with Kyōtarō in a well-meaning but misguided attempt to throw Anna's mother off the track.
  • Did Not Do the Bloody Research: One Twitter comic features Kyōtarō in a cap with the words "SUPER FUCK" written across it in English. Even if it's pretty in-character for someone like Kyōtarō to wear it, it's still a little jarring given the younger demographic the series is targeted at.
  • The Ditz: Among Anna's circle of friends (and to Kyōtarō), Anna is this. Kyōtarō once managed to convince a teacher to let Anna off the hook by pointing out that Anna was such a ditz she probably wrongly admitted to the crime she was accused of. He wisely did this by using such abstract language Anna didn't actually get she was being subtly insulted, but she mentioned feeling put out for some reason despite her gratitude.
  • Driven to Suicide: Played with in one of the extra chapters. Anna pretends to be a zombie and is about to bite Kyōtarō, but he rallies and "shoots" her. Then, after seeing her "dead" body on the floor and imagining her as an actual zombie he had to put down, he puts his "gun" to his head and shoots himself too. His internal narration notes, "If Yamada died, I'd die too."
  • Erotic Eating: Sometimes Anna does this, seemingly without meaning to. Only Kyōtarō seems to notice, so it's entirely possible it's all in his head.
    • That said, when she does stuff like open her mouth to show she just handed him an empty wrapper and the actual sweet is in her mouth, it often results in Something Else Also Rises.
  • Everyone Can See It: Plenty of characters have noticed there's something going on between Anna and Kyōtarō when watching them interact:
    • Both Hara and Nanjou-senpai's friend Mamiya figured it out by watching how they act around each other in the library.
    • Kana notices her brother has feelings for Anna when she sees them talking over the phone, and then realises Anna likes him back when she remembers she came to visit him while he was sick.
    • When Kyōtarō admits to Moeko that he might like Anna, she tells him she's already known about it for ages.
    • Yoshida can be seen quietly putting the pieces together when Kyōtarō shows up to Anna's home on the day the girls were meeting up to make Valentine's chocolates, while Anna dresses up nicer than usual for the occasion.
  • Eyes Always Averted: Kyōtarō generally speaks to other people like this, though he'll properly look his teachers in the eye when talking to them.
  • Green-Eyed Monster: As his feelings for Anna grow, Kyōtarō becomes much less tolerant of boys talking about Anna in a sexual way. Even before that, he was very wary of other boys who approached her. He is at least willing to acknowledge they aren't complete scumbags, as is the case with Nanjou-senpai who Kyōtarō distracted by "accidentally" sending his bike crashing into a canal but who helped him fish it out.
    • Anna is this whenever other girls get too close to Kyōtarō.
  • Idiosyncratic Episode Naming: The title of every main chapter is a first-person statement beginning with either "I" or "We", such as "I Met Up With Her" or "We Got Separated".
  • Injured Limb Episode: The Ichikawa family's trip to Akita in chapter 50 is cut short after Kyōtarō suffers a nasty fall exploring the woods, fracturing his right arm. He spends the rest of the winter break and the start of the next semester with his arm in a sling, and has to adapt to using his non-dominant hand for everything.
  • Innocently Insensitive: Of the "no social skills" variety. Because of his low self-esteem and general unfamiliarity with social interaction, Kyōtarō often misreads or completely misses Anna's attempts to get to know him or spend time with him. Generally she laughs it off and finds it kind of adorable, but on one or two occasions she clearly feels taken aback.
  • Iyashikei: Despite Kyōtarō's best efforts, the manga is most notable for how sweet it is.
  • Last-Name Basis: Kyōtarō and Anna address each other by their last names, as is typical of their age group. Anna is on first name basis with her circle of friends, though.
  • Leaning on the Fourth Wall: In Chapter 35 Kyōtarō is shanghaied into helping Chii study (since he scores so highly in science). She points out that she's surprised he's able to speak normally, since as far as she remembers he often speaks in very wobbly and shaky speech bubbles.
  • Love Epiphany: Kyōtarō realises he's paying more attention to Anna than his other classmates, but chalks it up to the fact that she's such a lively and beautiful person she automatically draws attention. But when Anna is smacked in the face by a basketball to the point her nose bleeds and she needs to be taken to the nurse's room, and when he overhears her tearfully apologise to her mother for getting hurt (since she had a photoshoot coming up), he realises he likes her.
  • Meet Cute: Played with. Anna and Kyōtarō are classmates, but apparently didn't really interact much until he happened to walk into the library when she was stuffing her face. He also lent her a retractable knife when he saw her trying to work on a class project.
  • Mood Whiplash: On Valentine's Day 2021, Sakurai uploaded a sweet, romantic comic to her Twitter with Kyōtarō buying Anna a box of chocolates as a gift. A few days later, she followed it up with a page where Anna messages Kyōtarō to complain she's having to work out extra hard to burn the calories from those chocolates, but phrases it in the most suggestive way possible.note 
  • No Sense of Personal Space: Anna sometimes comes right up to Kyōtarō when talking to him, often making him back up in a flustered panic. She seems to do this subconsciously, though, because on the one occasion Kyōtarō walked right up to her to whisper in her ear (to warn her a teacher was coming and to hide her snacks), she's the one who jolted away.
  • "Not So Different" Remark: When Anna glares at Moe in Chapter 31, Kyōtarō internally notes he's familiar with those murderous eyes.
  • Not What It Looks Like: In chapter 18, a teacher walks into the chemistry lab to find Anna kneeling in front of Kyōtarō behind a desk, coughing and covered in a white substance. Kyōtarō quickly confesses that the two of them snuck in to prepare a dessert in one of the beakers and Anna accidentally spilled it on herself, which gets them both in trouble, though almost certainly not as much trouble as they'd have been in had he not explained himself.
  • Oblivious to Love: Even though Kyōtarō realises he likes Anna fairly early in the series, he often misses or misreads cues that show she likes him in return. For example, at one point Anna tries to subtly get him to give her his number, but all her hints soar right over his head.
    • While it's pretty clear Anna likes Kyōtarō, she sometimes seems to not realise how some of her actions are really affectionate (such as having no problem clasping hands with him... in order to pass him some sweet wrappers to throw away for her).
    • Chii is an unusual case in that she's oblivious to the love between Kyōtarō and Anna, despite it being fairly obvious to most other characters who watch them interact.
  • Off-Model: Chapter 46 has a panel where, due to a shading error on Kyōtarō's collar, it looks as though his undershirt has exposed shoulders. In a tweet following the chapter's release, Sakurai would confirm that this was an error, but also included a drawing of Kyōtarō wearing an actual shirt with cut-off shoulders.
  • One Head Taller: Anna is taller than Kyōtarō. How much taller? When they stand facing each other, Kyōtarō's face is roughly somewhere between Anna's breasts, something he always realises fairly quickly.
  • Peek-a-Bangs: Kyōtarō has bangs that go over his right eye. It's notable enough that at one point when his hair is brushed aside Anna teases him by pointing out it's the first time she's seen his right eye.
    • Anna's friend Yoshida has long bangs as well, but not to the extent of Kyōtarō's.
  • Praetorian Guard: Anna's friends form one when they walk together in order to protect Anna from boys only after her for her looks. Each of them even has a role: Chii Kobayashi is the vanguard, Moeko Serine is the bannerman who uses her outgoing personality to Draw Aggro and Serida Yoshida is the rearguard who brings up the rear.
  • Refuge in Audacity: In Chapter 3, Anna suddenly realises she's being a third wheel when Hara and Kanzaki meet up in the library. She suggests there's a cat in the library, forcing Kyōtarō to do a poor imitation of a cat. Anna is so unimpressed she stands up, declares she's looking for said cat, and then walks away to mimic a cat herself. She and Kyōtarō wind up mimicking cats yowling at each other until Hara and Kanzaki leave.
  • Relationship Upgrade: As time goes on, it becomes increasingly more obvious that Kyōtarō and Anna are de facto a couple, despite neither of them actually bringing it up and only a small group of people being aware of it.
  • The Remake: Chapter 72 adapts the events of two of the bonus Twitter comics into a full chapter with more polished artwork, with Moeko giving out friend chocolates to the boys in her class and Anna challenging Kyōtarō to a game of chocolate Shogi. Chapter 73 would continue this trend, with Anna and Kyōtarō discussing what kind of chocolate you'd give to someone to tell them you love them.
  • Satellite Character: Of the members of Anna's clique, Yoshida is the least developed (in the sense we never see her interact with anyone outside of Anna's circle). Moeko and Chii have had exchanges with Kyōtarō that helped flesh them out.
  • Secret-Keeper: The few people who're aware of Kyōtarō and Anna's closeness (e.g. Moeko and Hara in school) keep it to themselves, recognising that for some reason the two of them don't want people to know about how close they are.
  • Single-Target Sexuality: Both Kyōtarō and Anna pretty much only have eyes for each other. Anna is pretty much the only person Kyōtarō actually interacts with regularly, while Anna often seeks out Kyōtarō.
  • Shipper on Deck: Anna is one for her classmates Kanzaki and Hara. Kyōtarō also takes an interest in their developing relationship, though he claims not to care about it.
    • Meanwhile, Hara herself is one for Anna and Kyōtarō, being the only one to have seen them interact with each other one-to-one.
    • Double Subverted with Kyōtarō's sister. Kyōtarō is worried she'll start acting like this as soon as she finds out about Anna, but when she does she assumes her brother developed an unrequited crush on a girl well out of his league, and tries to let him down gently. At least, until she realises Anna was the one who came to visit him while he was sick, at which point she immediately starts pestering him to ask her out.
  • Show, Don't Tell: One of the narrative devices the manga is known for. The most significant interactions between Kyōtarō and Anna come through poignant gestures of affection rather than through only dialogue. Not once have they declared their love for each other, but they do.
  • Something Else Also Rises: On a few occasions when Anna is really up close to Kyōtarō and he realises just how attractive she is, he often slouches in response.
  • Smells Sexy: When Anna is caught at school while it's raining, she borrows Kyōtarō's raincoat to rush to the convenience store and buy an umbrella (and snacks). After they part, Kyōtarō realises the raincoat is filled with her scent and continues to wear the raincoat home long after the rain has stopped.
    • When the pair accidentally switch their sports jerseys after P.E., Kyōtarō finally catches up with Anna in the library to switch back. He notices some grains of rice on the collar and chalks it up to Anna's messy eater tendencies, but it's all but stated that Anna was smelling his jersey just before he came in.
    • When Kyōtarō winds up at Anna's house and has to take a bath (they'd gotten caught in the rain and Kyōtarō's hand is still in a cast), he immediately notices the scent of the shampoo and recognises it as the smell of Anna's hair.
  • Sweet Tooth: Anna loves her sweets. And candies. And crepes. And...
  • Throwing the Distraction: Kyōtarō does this when he sees Nanjou-senpai (a particularly pushy senpai with a reputation of being a playboy) is on the verge of making Anna give him her contact details. He sends his bike hurtling downhill until it crashes into the nearby canal, successfully distracting Nanjou-senpai... along with everyone else in the vicinity.
  • Twice Shy: Initially. It's pretty obvious Anna genuinely enjoys being around Kyōtarō, and Kyōtarō all but admits to himself he likes, maybe even loves her, but neither of them know how the other feels. It's not until later that they put two and two together.
  • Unknown Rival: Nanjou-senpai has a reputation of being a playboy and has his eyes set on Anna. He has absolutely no idea that he has a rival in Kyōtarō, who is so far ahead of him as far as Anna's concerned that Nanjou himself isn't even at the starting line yet.
    • He does get an inkling when he and his friend Mamiya happen upon Anna and Kyōtarō in the library.
  • Wall Pin of Love: in Chapter 43, Anna is confused as to why Kyōtarō has been avoiding her and not visiting the library. In an act of desperation, she has to flag Kyōtarō down, chase after him, and then grab and press him into a wall to get him to talk. The "don" part of her kabedon results less from her hand hitting the wall and moreso Anna slamming Kyōtarō against it.
  • What You Are in the Dark: The main ethos of the series. Kyōtarō and Anna do not behave the same way when they're alone together compared to when they're at class. In front of others, they're seldom in any sort of contact. When they're alone together, they are playful and tender.
  • Women Are Wiser: Played with. Kyōtarō definitely comes off as being smarter than Anna, but Anna is clearly much more social. That said, sometimes she doesn't notice when she's being slighted, such as the time Kyōtarō watched her on a TV program and realised that a lot of her scenes were edited out. He worries that she'll be depressed at school, but the next day she's just happy she got to be on TV.

Alternative Title(s): Boku No Kokoro No Yabai Yatsu, Boku Yatsu