The two high school girls are Kokoro that the man pretended to be confused and got on the girls' school bus by mistake, and as they see him, they start to play pranks on him. They accidentally show off their underwear, press their crotches against him, and when they can't hold back, their hands reach out for his erect cock. The girls' actions escalate and they can't hold back from just playing pranks, and they even have sex on the bus!