[6] The manga adaption, by Kendi Oiwa, eliminates the Dog storyline, and combines Voice and Twins, with Morino taking Natsumi's role in the final story.

Kamiyama (Kanata Hongō) is an outwardly, friendly and popular boy who hides his potentially sociopathic nature with a carefree, happy attitude.

Loner Morino (Rin Takanashi), on the other hand, does little to hide her strange nature; she never smiles, does not interact with her classmates, and wears a long-sleeved, black school uniform even during the middle of summer.

Initially happy to exchange books on morbid subjects, a series of recent murders spark their interest and they begin investigating the killer.

This serial killer has a fondness for cheerful young women and, after severing their left hand as a trophy, displays their dead bodies in public locations to be discovered.