Worried about Sayaka's loneliness after her husband passed away, she decided to live with her daughter and son-in-law. Thanks to this, Sayaka is living a peaceful life, but there have been some troublesome incidents. Sometimes she hears their nighttime activities and can't help but peek, getting excited. One day, Sayaka was caught masturbating by her son-in-law and forcibly taken. After that, unable to resist her son-in-law's aggressive advances, she began to repeatedly have affairs behind her daughter's back. Despite feeling guilty, her relationship with her son-in-law continued. And gradually, her jealousy towards her daughter grew...
