Kenichi is fed up with his mother constantly nagging him to study, so one day he asks his visiting friend Yuka to help him. Yuka is a brilliant, beautiful, and sexy woman who graduated from a national university. Her perfect charm makes Kenichi flustered and uneasy. Observing his innocent reactions, Yuka teasingly says with a playful smirk, "Instead of studying, I'll teach you about girls." Enchanted by her mischievous allure, Kenichi becomes bolder, eventually sneaking into the bathroom while she's bathing to catch a glimpse.