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...

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...