Natsumi is invited by Tokyo Metropolitan Police headquarters to become the first female bike trooper but hesitates to tell Miyuki. Miyuki already knows and gives her an alarm clock as a farewell gift, later becoming depressed and distracted on duty. Natsumi hints she wants to return while escorting a marathon when a burning truck causes chaos. A runaway semi-trailer heads downhill toward the danger, and Natsumi helps Miyuki and Ken stop it just in time. She resigns from headquarters and returns to the precinct, reuniting with Miyuki.