Yuko Kazuki, a soothing beautiful mature woman, makes her Madonna debut with her sister-in-law! Mr. and Mrs. Kazuki are in a period of boredom after their third year of marriage. Knowing that her husband had a relationship with his friend in the past, his wife, Yuko, who has been inexplicable jealousy, seduces her husband's younger brother who lives with her in revenge for her husband. , and my brother-in-law, who tasted it, brought a friend to his house.