It all started with a small, trivial incident. Feeling the need to pee on her way home from shopping, Shoko rushes to a neighbor's house, but unfortunately, no one is there. Unable to hold it any longer, she has no choice but to relieve herself there and then. However, she is spotted by the neighbor who has just returned home. With a lewd smile on his face, the neighbor threatens her for trespassing and public indecency. Because of her single failed attempt at peeing, Shoko is forced to undergo a series of humiliating urination play training.