Chisato Shoda, a renowned stretching instructor, lives in an old single-family home with her stepson. Lately, however, his cold attitude has left her emotionally unsettled. One day, upon realizing her son is being bullied, Chisato chooses to sacrifice her own body to protect him, becoming a sexual offering for the delinquents. Witness the shocking scene as her mature body is violated in front of the very son she loves.