Marina-sensei, known for her huge breasts, works as a private tutor for Shota. Enchanted by Marina's voluptuous chest, Shota repeatedly plays naughty pranks by touching her breasts and nipples in various ways. Highly sensitive, Marina ends up climaxing multiple times from the relentless breast play. Eventually, Shota insists on practical lessons using Marina's body, claiming it's necessary to pass his health and physical education exam.