MPD Traffic Department members Momosaki Toko and Yagi Shiori are murdered one after another. Detective Sato and the rest of the police begin canvassing the neighborhood where Yagi fell. Miyamoto Yumi arrives on the scene and offers a certain tip... In order to acquire more hints, Yumi calls Miike Naeko, who went to karaoke with her colleagues the other day. All the while, a suspicious man listens in on her conversation with Naeko.