Yukina Shirahane has always fancied her childhood friend Ginta Akashi. Yukina, who belongs to the swim club, began playing with his crotch while sniffing Ginta's gymnastics tracksuit in the girls' locker room after everyone returned. Her embarrassing figure is spotted by the swim club advisor who suddenly enters. Yukina, who has a weakness, stretches her body following her advisor's advice and loses her virginity in the worst way.