Since her daughter Kyoko got married last year, Ryoko has been alone and has a lot of free time. One day, Kyoko's husband Kazuya suddenly visits her house. "The truth is, Kyoko has been cheating on me..." Kazuya suddenly confesses, and Ryoko is left speechless when he is confronted with the truth... However, the infidelity committed by her own daughter cannot be easily erased, and from that day on, Kazuya's "revenge" begins. Kazuya's "revenge" is too stimulating for Ryoko's body, which has been frustrated for a long time...