Tsubasa and Masaya are a clean-loving couple. One day, a construction worker doing roadwork near their home comes by and asks to use their bathroom. Fastidious Masaya refuses, but the worker barges in anyway and ends up urinating all over their toilet. The next day, while Masaya is away, the workers return. When Tsubasa loudly complains, they become enraged and gang rape her. Initially disgusted to the point of nausea, Tsubasa gradually begins to feel pleasure in being defiled, discovering new sensations she's never known before.