One day, the Mikami household's toilet suddenly breaks down. They call a repairman, but mother Chinatsu has to go to the toilet at exactly that time. She wants to go, but she can't... if she keeps going like this, she'll wet herself. Finally, unable to hold it any longer, Chinatsu opens the veranda door and relieves herself in the garden. Chinatsu's urine spurts out with force, tracing a beautiful parabola... Akira, the son, has been watching his mother's shameless behavior from the shadows, and begins to feel an excitement and sense of guilt he has never experienced before...