His wife cheated on him, so he decided to take revenge on his mother-in-law.

Ever since her daughter Kyoko got married last year, Ryoko has had too much free time by herself. One day, Kyoko's husband Kazuya suddenly visits Ryoko's house. ``Actually, Kyoko was cheating on me...'' Kazuya suddenly confesses and Ryoko is at a loss for words when confronted with the truth... However, the injustice committed by his own daughter cannot be easily erased, and from that day on, Kazuya's "revenge" begins. Kazuya's "revenge" is too stimulating for Ryoko's long-dissatisfied body...