Natsumi Tsujimoto, a spirited moped rider, is late for her first shift as a patrol officer with the Bokuto Police Department. In her haste she takes several shortcuts, only to be pursued and cited by the mechanical genius and expert police driver Miyuki Kobayakawa. When she arrives at the precinct, Natsumi discovers that Miyuki will be her new partner. Initially skeptical, the two quickly forge an unbreakable bond, confronting traffic accidents, reckless drivers, and even the fiercest typhoons that strike Tokyo together.