Hibiki, a girl returning from overseas with soft, big breasts, transfers to a class full of boys! What's more, she's always naked, so all the lustful men are captivated by her. The teacher who was supposed to be giving a lecture ends up having sex, the students are all given titjobs during class, she is attacked one-sidedly in the boys' bathroom, and there is a forced lotion threesome in the locker room. The free-spirited, sex-filled school life with naked high school girls is very exciting!