Mizuki and his wife were asked by her husband's childhood friend, Murakami, to sign the witness column of the divorce report. The two married couples hesitate to respond, but Murakami, who has had sexual desire apart from her wife, lusts for her friend's wife. Murakami takes advantage of her kindness and appeals for the spiciness of her single life. Mizuki, who was invited to her sympathy, soon ...