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!!The manga
* AlternateCharacterInterpretation: Is Kamiyama a VillainProtagonist, a SociopathicHero, an AntiHero, and/or JerkWithAHeartOfGold, [[JerkWithAHeartOfJerk unless he isn't]]? Is Morino a BrokenBird EmotionlessGirl SugarAndIcePersonality or a FemmeFatale playing DeathSeeker with a WoundedGazelleGambit? How many of these things can they be at the same time?
* CompleteMonster: The MonstersOfTheWeek from the first and second chapters:
** "Wristcut": Mr. Shinohara, the chemistry teacher of Itsuki Kamiyama and [[EeriePaleSkinnedBrunette Yoru Morino]], is a [[AxCrazy lunatic]] with a fetish for [[AnArmAndALeg slashing off the hands]] of innocent people, even lopping off the paws of [[BadPeopleAbuseAnimals animals]] and cutting off the hands of [[WouldHurtAChild children]]. Shinohara finally graduates to full-on murder when he kidnaps and kills a local celebrity for her hands, and when he's convinced to believe Morino stole his collection of hands, Shinohara attempts to murder her in berserk rage.
** "Goth": The seemingly-innocuous cafe manager is secretly a SerialKiller who sadistically mutilates and murders women, before cataloging the gory details of his kill in his notebook. A [[HeManWomanHater hateful misogynist]], the manager tells his victims they are guilty sinners who deserve to die. Capturing Morino, the manager only keeps her alive for the time being out of fear the police are on his tracks while telling the captive girl how much he looks forward to brutally killing her.
* NightmareFuel: The things most of the criminals encountered do in the stories. Chopping off hands (including those of a baby), murdering people and spreading their organs around, leaving people to die buried underground... wherever the main characters live must be a pretty grim place.

!!The 2008 live-action film
* CompleteMonster: The film [[CompositeCharacter amalgamates the characteristics]] of the manga's first and second chapters' [[SerialKiller killers]]. Obsessed with beauty, this version of the cafe manager kidnaps women, [[AnArmAndALeg chopping off]] and [[CreepySouvenir keeping their hands]], then leaves the corpses in public places to [[MadArtist create his depraved aesthetic]]. Linked to deaths of four women, the manager nearly kills Yu/Yoru Morino as well. Stopped by Itsuki Kamiyama revealing he holds the manager's journal detailing his entire modus operandi and forced to flee town, he no doubt intends to pursue more victims.
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