The heroine of this work is Chisato Morisaki, a female student at Sonomiya Gakuen, who produces many winning athletes in all sports competitions. He is refraining from participating in national competitions both on land and in swimming. A serious and stoic athlete, she is devoted to practice and abstinent. Such a beautiful girl is caught by a terrifying metamorphosis group and becomes a prey to overwhelming Ling ●. While weeping in shame, she panics when she reveals her indecent part. The door of her lewd world was opened.