Miou attends a certain swimming class. Both her parents work, so she is always alone. Miou is an innocent girl who doesn't know how to swim or have any knowledge of sex. Today, the teacher and adult men are at the pool as usual. As she floats in the water, the adult men surround her. They make Miou touch and lick their penises, which they use to pee, and finally they thrust them into Miou's peeing spot. Miou doesn't know what's happening as a lot of white pee is released inside her. After the pool is over, she is taken to a place where adults gather. Again and again, without her mom and dad knowing...