Saeko had an "illustrious" past, she was a sex addict and was willing to let countless men make love and ejaculate straight inside her, even people she didn't know. And as a result, she gave birth to Kaori. She really didn't know who her father was and only dared to lie to her that she and her husband had divorced early. Since giving birth to Kaori, she has been able to calm down and control herself. She no longer has sex with anyone else but only focuses on taking care of Kaori and raising her to adulthood. Time passed, Kaori is now married. Kaori's husband is Hiroyuki, a very kind and gentle person, who helps Saeko a lot. However one night, Saeko witnessed her son-in-law having wild sex, Hiroyuki fucked Kaori like an animal causing memories of the past to come rushing back. It had been so long since she had enjoyed that feeling of joy that she couldn't calm down and came up with a very wrong idea. On the occasion of Kaori's trip with friends, she changed into a thin and skimpy yoga outfit. She continuously made moves to seduce Hiroyuki, causing him to gradually fall into the sensual trap she had set for him...