A young and beautiful wife, Satomi, remarried and was living happily with her husband and her step-son Akio, but recently her stepson Akio has been acting strangely. He suddenly stood behind Satomi and tried to hug her... Satomi tried to talk to her husband about it but he didn't take her seriously, so she tried to think it was just her imagination... But then, she came across Akio masturbating with Satomi's underwear and he attacked her.