After her husband Shinichi loses his job, wife Arisa visits his former boss, Ito, seeking advice. Ito kindly offers guidance and hires Shinichi as a driver while assigning Arisa to manage his vacation home. One day, Arisa secretly uses the bathroom to relieve her work fatigue but is caught by Ito, who punishes her with a spanking as discipline. Afterward, Arisa becomes increasingly sensitive to even minor stimuli, her mental state gradually deteriorating. Ultimately, she ends up taking irreversible actions.