Misogynist and philanderer Ichiro Honda (Noboru Nakaya) has an insatiable sexual appetite which is not being satisfied by his distant wife whom he only really sees on weekends. While he is away from Osaka for work, his time is spent living a double life in Tokyo, filling his nights with consecutive sexual conquests, the details of which he meticulously records in his ‘hunter’s diary’. One day, he reads about the murder of a woman in the paper; she is one of his previous ‘preys’. A few days later, another such woman dies in mysterious circumstances. Suddenly, a string of women he has bedded start dropping like flies in a calculated killing spree, with Ichiro as the only suspect.