After school, on her way home, the young girl Tsuna is suddenly kidnapped by a pervert. When she regains consciousness, she finds herself chained inside a filthy shared building restroom. Trembling in fear, her body paralyzed and unable to resist, the man subjects her to various forms of pleasure torture to satisfy his desires. Inexperienced and highly sensitive, her body reacts intensely, repeatedly losing control of her bladder. How will her pure, innocent body endure this cruel situation?