One day, Tsubasa discovers that her only son, Koji, is being bullied. Upon learning this, she resolves to protect her son at all costs, even if it means putting herself in harm's way. However, Yoshino, the ringleader of the bullying, devises a cruel plan to assault her in front of her son. Yoshino strips naked in front of Koji, forces Tsubasa into masturbating, and repeatedly takes humiliating photos. Subjected to this relentless sexual torment, Tsubasa gradually begins to feel pleasure, eventually moving her hips on her own and passionately begging Yoshino for more. In this way, Tsubasa falls completely under Yoshino's control, losing herself entirely.