My friend's mother

Satomi's stepmother has more feelings for her shy and quiet son, Ryota than her mother. One day, Ryota invites his friend Daisuke to his home. Satomi is happy, but Daisuke is spotted masturbating by calling Ryota's name in the living room, and is threatened and goes to her for what she says. Satomi continues to be sought after Daisuke's body and turns into a meat toilet.