A former classmate of the protagonist who descends into madness after a series of homicides. He becomes a brutal murderer obsessed with the protagonist, constructing a shrine in his apartment. After losing an arm in a scuffle, he kidnaps and tortures her, resulting in the companion's injury. Ultimately, he is killed by the protagonist after falsely claiming to have murdered the companion.
School acquaintance who observes Shiki's behavior and delivers ambiguous warnings.