Miyou, who attends a certain swimming class. Her parents both work, so she's always alone. Miyou doesn't know how to swim and has no knowledge of sex; she is an innocent girl. Today, there are her teacher and adult men at the pool. As she floats in the water, the adult men surround her. They make Miyou touch their penises, lick them, and finally penetrate her urethra with it. Miyou, who was filled inside with white semen, doesn't understand what happened. Even after swimming class ends, she is taken to places where adults gather. Over and over again, in secret from her parents…
