When she wakes up, she finds hemp rope digging into her entire body, rendering her unable to move. Confused by this strange situation, Mayuko calls out to her son Satoshi for help, but Satoshi, with bloodshot eyes, just caresses her body. It was Satoshi who tied Mayuko up while she was sleeping. She knew that Satoshi had a secret sexual fetish. But she never imagined he would choose his mother as his target... Mayuko desperately tries to escape, but the more she struggles, the more the hemp rope digs into her body, further depriving her of freedom. Mayuko has no way to resist.