Haughty and elegant company chairman's daughter, Reiko. The new maid serving her, Taeko. One day, while Reiko is deeply absorbed in violin practice, Taeko can no longer endure her urge to defecate and quietly pleads, "I'm sorry to interrupt your practice, but may I please use the restroom?" However, Reiko coldly replies, "You are not permitted to use the toilet. Endure it until my practice is finished!" Faced with this harsh command, Taeko reaches her breaking point and fiercely punches Reiko, knocking her unconscious. That single strike unleashes years of pent-up frustration and shame buried deep within Taeko's heart. Now, she begins her revenge against Reiko, determined to repay every humiliation she has ever endured.