A group of innocent schoolgirls arrive at a countryside inn for their school trip. These girls, at the cusp of womanhood, are incredibly pure and eager to learn even things they'd never be taught in school! They're fascinated by a man they happen to encounter in the open-air bath. Excited by his penis, which they've never seen before, they wiggle their small, cute bodies and playfully touch and lick it, saying things like, "Can this even fit?" Their excitement is amplified by the unique, non-ordinary atmosphere of the trip, leading them to increasingly daring sexual adventures!