Honda, who is married to a frigid wife he sees only on weekends, satisfies his overwhelming sexual appetite by systematically seducing women and recording his experiences in a notebook which he calls "The Hunter's Diary." Suddenly, each of Honda's women is found murdered and the police use his blood and semen types to arrest and convict him of the crimes. Honda's new attorney, hired to appeal the conviction, senses that the real killer, acting out of revenge, knew of Honda's rare blood type and planted the evidence at the scene of the crimes. The killer is revealed to be Honda's wife, who became enraged when she found her husband's diary, in which her name was entered first along with the notation that she was not a virgin.
Released in Japan in 1964 as Ryojin nikki.