When two police detectives get involved in their operation, the nurses of Mochizuki Hospital must wield their instruments-katana, machine gun, and pistol-with even greater precision to excise the cancerous Masaki. As each nurse uses her particular specialty to dispatch Masaki's thugs, Arashi pursues the root himself. Arashi may struggle with his piecemeal identity, but treating this human virus is something both sides of him are sure of...

When a black-label target recognizes Mikoto on an extermination operation, Arashi is troubled by the realization that he knows little of his teammate's past. But as Arashi's unsympathetic attitude only widens the distance between them, Mikoto finds herself confiding in another-a new student, Chikage, whose burn scars are proof that her childhood holds painful tragedy as well...