Sakurai Tsubasa is a newcomer in the Metropolitan Police Department's traffic division — unremarkable, by her own estimation. Then an unusual man named Hozumi Rui appears and informs her that she has a rare ability — a talent for memorizing faces and, apparently, for leading criminals to arrest without quite meaning to — and that because of it, she is being forcibly transferred to the Emergency Mission division. Her new colleagues are skeptical. Her assigned partner is the person she has to rely on to figure out what her new role actually involves, while she builds the bonds — and maybe something more — that might make her belong there.