[[quoteright:262:http://static.tvtropes.org/pmwiki/pub/images/Ibitsu_9624.jpg]]
An urban legend in Tokyo states that at midnight, a girl dressed as a lolita will appear and ask you one question. You mustn't answer this question, however, for if you do the girl will come to be your younger sister. She will say that she has finally found her big brother, and insinuate herself into every aspect of your life... until she finally gives you a "twisted" death.

Kazuki, a young college student living in a small apartment building, is taking out his trash one night when he sees a disheveled young woman dressed in lolita-style clothing sitting in the street by the neighborhood trash pile. Unnerved, he tries to ignore her and pass by, when she asks him a single question: "Do you have a younger sister?" Surprised, he answers that he does, before running off to the safety of his apartment. Passing it off as an isolated encounter with a strange woman, Kazuki decides to think nothing more of it.

But then he starts to see her more and more, and each time her behavior and appearance seem more unusual than the last. When he learns that she's been going through his trash and has even found a way into his apartment by passing herself off as his younger sister while he's at school, he begins to fear that she may even be dangerous. After hearing the legend of the "Strange Lolita", Kazuki becomes determined that he needs to protect himself by scaring the bizarre woman away once and for all. Unfortunately, the young man has no idea of the horrors that await him...

''Ibitsu'' ("Twisted") is a [[HorrorAnimeAndManga horror]] {{manga}} drawn and written by Ryou Haruka. It was released in 2009 by publisher SquareEnix, and serialized in the manga magazine [=Young GanGan=]. The published volumes also came with two unrelated side stories: ''The Corridor Of Dolls'' which is about a group of friends entering a haunted building to write their names on the Wall Of Romance and ''The Mysterious Tale Of The Editor'' which is about a mangaka who is plagued by the strange demands of an equally strange editor.

Not to be confused with Kazuto Okada's SexComedy manga (and film) of the same name.[[note]]Well, almost the same. Okada's ''Ibitsu'' is spelled in hiragana, while Ryou's is spelled in katakana. See JapaneseWritingSystem.[[/note]]
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!! Tropes present in ''Ibitsu'' include:

* AbandonedHospital: When the group of friends hear about a sighting of the Strange Lolita near an abandoned hospital, they go to check it out in hopes they'd find something out about her. Fortunately, they do. [[spoiler:It's also the Lolita's base]].
* AnnoyingYoungerSibling: Kazuki treats Hikari this way, though it's mostly due to her treating him somewhat like a child, coming into his house and cleaning his room, etc. He appreciates it though.
* AxeCrazy: The Lolita, the Editor, the Dolls...
* BigBrotherBully: The Strange Lolita's older brother who regularly abused her, who killed their parents and then himself. [[spoiler:Subverted, as he was another victim of the Strange Lolita]].
* BlackComedy: The "punchline" of ''The Mysterious Tale Of The Editor'' is quite black indeed.
* CreepyDoll: The bonus story ''The Corridor Of Dolls'' is about some of these.
* CriticalPsychoanalysisFailure: The Lolita's doctor [[spoiler: appeared to have gone on a killing spree before committing suicide. But it turned out to have been all her doing]].
* DeadPersonImpersonation:
** The Strange Lolita's aim is to kill Kazuki's sister and eventually become her. [[spoiler:They also murdered and pretended to be the child in the story]].
--> [[spoiler:"You killed the real Kanbe Remina... and became Remina."]]
** This is the aim of the dolls in ''The Corridor Of Dolls''.
* {{Diary}}: When Kazuki and friends get to the AbandonedHospital, Kazuki finds the diary of a doctor who looked after the Strange Lolita after her brother killed their parents and himself.
* DownerEnding: [[spoiler: Kazuki is dead, along with his parents, sister, and friends and gets the blame for the murders and the ending shows the Lolita looking for her next victim]]
* EyeScream: The Strange Lolita staples Kazuki's eye open so he can draw a picture of her.
* {{Fingore}}: Multiple examples. Such as the Strange Lolita trying to make herself more beautiful by stealing the finger nails of other girls.
* FollowTheLeader: If you're familiar with ''TheRing'' or the work of JunjiIto, you'll find a lot of similarities here, both broad (the cycle of [[spoiler:monster kills everyone, lives on as rumour]] is very Ito-like) and specific (fingernails stuck in a wall a la Sadako).
* FreudianExcuse: [[spoiler:Subverted. It looks as though the Strange Lolita got her emotional problems when her elder brother abused her, murdered their parents and killed himself, but at the end it's revealed that isn't her]].
* GirlsLoveStuffedAnimals: The Strange Lolita carries around a rabbit doll. [[spoiler:That is filled with the organs of her most recent "brother". In the end, Kazuki's insides are stuffed inside]].
* {{Gorn}}: Ramped up steadily as the series goes on. And it ''starts'' with a stuffed animal spraying blood everywhere when it's washed.
* HopeSpot: After the events at the hospital, Kazuki wakes up home and safe with his parents. It doesn't last long.
* ImpaledWithExtremePrejudice: [[spoiler:Kazuki's father is impaled with his golf clubs]].
* [[spoiler:KarmaHoudini: The Strange Lolita, typically for J-horror, gets away free and clear.]]
* [[spoiler:KillEmAll]]: The outcome of both ''Ibitsu'' and the two side stories.
* {{Kneecapping}}: When the Strange Lolita corners Hikari and a classmate in the gym after school one night, she takes the classmate out of the picture by smashing her kneecap with a sledgehammer.
* MadnessMantra: "Big brother. Big brother. Big brother. Big brother."
* MurderTheHypotenuse: The Lolita's solution to the fact that Kazuki already has a younger sister is to personally make sure that Hikari is taken out of Kazuki's life... permanently.
* MurderSuicide: This is what the police make of all of the Strange Lolita incidents.
* PoliceAreUseless: There have been a lot of claims from people being attacked and stalked by a strange lolita, but the police have dismissed all of these claims as daydreaming.
* PottyFailure: Hikari pees herself when Strange Lolita [[EyeScream eats an eyeball]].
* ReplacementGoldfish: The backstory ''The Corridor Of Dolls'' is that a doll maker tried to make a replacement doll for his dead wife before he died himself.
* SelfHarm: The Strange Lolita hurts herself when she feels she isn't a good enough sister.
* SelfMadeOrphan: The Strange Lolita's brother killed their parents and then himself. [[spoiler:Apparently.]]
* SerialKiller: Kazuki is horrified to learn, far too late of course, that he's not the first person approached in this manner. The others who became the Strange Lolita's "older brothers" were never heard from again.
* [[spoiler: ShootTheShaggyDog: Kazuki is dead and has been framed for the murders committed by the Strange Lolita, who lives on to continue looking for older brothers as an "urban legend"]].
* StalkerWithACrush: The "Strange Lolita", though she seems to be seeking more of a (albeit extremely twisted) brother-sister relationship than a romantic one.
* WhenItAllBegan: The Strange Lolita's abusive elder brother killing her parents. [[spoiler:Subverted, as he was just another victim and the Lolita took over the sister's role]].
* WouldHitAGirl: The Lolita routinely drives her victims to this.
* {{Yandere}} - In ''The Mysterious Tale Of The Editor'' the editor is yandere towards "Alice Yuu", a fictional character she created.
* YearX: The flashback to The Strange Lolita's past is set in 20XX.