A man pretends to have made a mistake and gets on a girls' school bus. In an all-girls environment, he can't help but get an erection when he sees a glimpse of her breasts, panties, and armpits. Then, noticing the man's gaze, a high school girl gives him a seductive peek, making his penis swell even more. His mischievous Kokoro turns to excitement, and the high school girl, unable to hold back, reaches for the man's penis without being noticed by the people around her...