Manami Mana is a sheltered young lady attending a prestigious private girls' school. She noticed a man who seemed down and, with the intention of helping, approached him. The man was an executive of the secret female body training club "Inkaku." The innocent beautiful girl falls into a trap and becomes prey for the perverse S-type old men. Under the overwhelming series of tortures, her body reacts, transforming her into an M. Mana was seen with a look of ecstasy, sucking on a penis.