Rookie detective, Sahara Natsuki, is assigned to the Investigation Division of Ginza police station. Here he has an unexpected reunion with his father and veteran detective, Akimura Shimao, whom he has been estranged from since his parents' divorce. They find themselves unwilling partners, butting heads repeatedly. Over time, however, Natsuki learns more about how to be a good detective from his father and possibly how to let go of their past as well.