 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.While these two seem to share little in common and do not interact with each other in front of their peers, their shared interest in death and murder has turned them into an unusual duo.Initially happy to exchange books on morbid subjects, a series of recent murders spark their interest and they begin investigating the killer.