Complete Monster: The second chapter's killer is a cafe manager who sadistically mutilates and murders women, before cataloging the gory details of his kill in his notebook. A hateful misogynist, the manager tells his victims they are guilty sinners who deserve to die. Capturing Yoru 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.
Nightmare Fuel: 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.