Toshio, a 42-year-old single man whose hobby is frequenting brothels, is suddenly approached by a mysterious woman who introduces herself as Iris. She begs him to teach her how to please men! Naturally, Toshio—blessed with an insatiable sex drive—has no reason to refuse. He takes it upon himself to give the completely inexperienced Iris a thorough sex education.

However, Iris is actually a princess from another world... and when Queen Cattleya sees how far her daughter has fallen, she appears before Toshio herself!