History Manga / Onidere

[[caption-width-right:255:[[NamesToRunAwayFromReallyFast The Demon Head Gang]] [[hottip:*:from left to right: Momo, Mitsuki, Yuna, and Saya. Also Tadashi on the far right.]]]]

Not to be confused with YandereKanojo, which has a strikingly similar concept, but is only similar to this series in that regard.

* EmbarrassingFirstName: Saya's full name is actually ''[[spoiler: Angelica]]'' Saya Ikushima.

*** [[spoiler:That's nothing. Now Saki's doing it under the alias Kurosaki. Making it a Love Hexagon.]]
*** [[spoiler:I don't think standard two- and three-dimensional geometry covers it anymore.]]
*** [[spoiler:It's a Love Hypercube then?]]
*** [[spoiler:It goes straight to LoveDodecahedron.]]

** [[spoiler: Saya's Father]] who can recieve a KillSat ''without'' even notice it and can stop Saya with a single hand move. So far nothing has managed to even scratch him [[spoiler: except Saya's food who brought him down in half a plate]]

* EverythingsWorseWithBears]]: Other then Mitsuki's liking for bears, a [[ShroudedInMyth common myth]] about Saya is that her boyfriend is a bear. Unless Tadashi has a TomatoSurprise sometime soon, it's not true.

* IllGirl: Saya's Mom she seeks to deny the trope by [[EverythingsWorseWithBears fighting bears]]. It does not work nor does it fool anyone.

* {{Yandere}}: Suzune Yumi, Yuna´s [[spoiler:big [[DroppedABridgetOnHim brother]]!]] Kenji really is an unlucky guy...

* ShallowLoveInterest: It's been argued whether Saya, Tadashi, or ''both'' fit this--both are primarily characterized in terms of their connection to each other.

* {{Nakama}}

* [=~Chekhov's Gun~=]: In Chapter 30 Momo attacks the '''Student Council President''' with an attack that invokes TheFourGods, and when that doesn't work she puts on a beak-shaped mask and draws a sword. Later she uses the same mask and sword when she [[spoiler:reveals her identity as one of Hao-Su, which just happen to be themed after TheFourGods]].

* [=~Masochist's Meal~=] served with GargleBlaster: There are only two people who would willingly eat Saya's prepared meals. One does it for love, and the other actually ''likes'' it.

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* AcquiredPoisonImmunity: [[spoiler: In one chapter, a potion causes everyone to turn into a baby except Tadashi. Shu says that due to him eating so much of [[LethalChef Saya's cooking]], his stomach has developed the ability to digest ''anything''.]]

* [=~Everything's Worse With Bears~=]: Other then Mitsuki's liking for bears, a [[ShroudedInMyth common myth]] about Saya is that her boyfriend is a bear. Unless Tadashi has a TomatoSurprise sometime soon, it's not true.

* TheFaceless: Momo is never seen not wearing her bandana.

** Actually she's not ill, so much as [[OurSoulsAreDifferent her soul keeps slipping out of her body]].

* [[ImTakingHerHomeWithMe]]: Mitsuki's default reaction to anything that looks like a [[strike: cute]] bear.

* IntoxicationEnsues: latest chapter. And it was because of ''[[MushroomSamba mushrooms]]''.

* KidAnova: Kenji Taketori, Saya's [[spoiler:[[ArrangedMarriage fiance]]]].

* CrowningMomentofHeartwarming: [[spoiler: When Momo gets called into action by the Haou-Su, she struggles with her loyalties between that and the Demon Head. The other Demon Head members noticed and thought they were to blame and even Saya is pulled away from her obsession with Tadashi. Culminating in them finding out the and still accepting Momo, who rejoins in tears.]]

* [=~I'm Taking Her Home With Me!~=]: Mitsuki's default reaction to anything that looks like a [[strike: cute]] bear.
* IneffectualSympatheticVillain: the Haou-su are quickly degrading into this. They would have easily gone on with their plan to [[spoiler:separate Tadashi and Saya]] by transferring to their school, if it weren't for the fact that they could barely stand, ''literally'', being in the same place with members of the opposite sex.

** LovesMyAlterEgo: really, ''really'' gets nuttier by the recent chapters.

* SecretKeeper: Momo actually knows about Saya and Tadashi's relationship, and helps them keep it a secret. Even when they don't know that she knows.

** Also in chapter 136, one of the leaders is [[PrinceOfTennis Echizen]] of [[ShonenJump Jump]].

* StopHelpingMe: [[spoiler:The final boss between Tadashi and Saya was actually trying to help them. His robot would have let them meet each other, if their well-intentioned friends didn't attack it and triggered its combat mode.]]

** [[spoiler: [[RelationshipUpgrade: And they're a couple in the final chapter]].]]

** Her tea is so bad that it makes people flashback to ''[[BeyondTheImpossible the rest of her cooking]]''.

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** [[spoiler:And finally speaking for real and without her mask in the end.

* {{Expy}}: Tadashi Mom sometimes feels like an older version of [[ToraDora Minori]].

* BeautifulAllAlong: Yuna has always been good-looking, certainly, but once she loses the delinquent clothes and lets down her hair she starts skirting EvenTheGirlsWantHer. [[spoiler:Momo when she takes her mask off.]]

Not to be confused with Yandere Kanojo, which has a strikingly similar concept, but is only similar to this series in that regard.

* BeautifulAllAlong: Yuna has always been good-looking, certainly, but once she loses the delinquent clothes and lets down her hair she starts skirting EvenTheGirlsWantHer.

* ShoutOut: Am I the only one, who is reminded by Saya´s [[SuperpoweredEvilSide Hyakki Yagyou mode]] on a certain [[ShingetsutanTsukihime Moon Princess]]... No, [[SailorMoon not this one!]]

* GeniusBruiser: In a surprising twist, Saya has the 2nd highest grades in the class.