Officer Takagi comes back to the police department after an all night stakeout and gets reprimanded by Officer Sato for his poorly appearance. The other male policemen gets jealous and finds out Shiratori has found another woman who looks exactly like Satou (Kobayashi-sensei). When Detective Boys and Kobayashi-sensei go to see the fireworks, Kobayashi-sensei gets left behind and overhears a quarrel and sees the figure of the culprit run away in the shadows and sees the stabbed victim.