The Cornered Mouse Dreams of Cheese

Kinky Kyoichi is a serial cheater and makes love to different easy women. The salaryman meets with an old class-mate from university called Wataru. Surprisingly, or not, he is an investigator hired by Kyoichi's wife to look into the
Due to his indecise nature, Kyoichi, an advertising company employee, repeatedly cheats on his wife. One day, he meets Wataru, an old classmate from university. Wataru reveals that Kyoichi's wife hired him to investigate whether Kyoichi is having an affair. Wataru, who has liked Kyoichi for the past 7 years, takes advantage of the situation and blackmails the salaryman: if he accepts to have a sexual relationship with him, he won't tell his wife about his infidelity.