The story of two female high school students whose hearts were captivated by lesbian sex at school, which began out of mischief. In the library, they engage in intense tongue kisses, and in the health room, they rub each other's breasts. In front of the podium, Yurina licks Nami's small nipples and teases her with finger penetration. In the sports equipment storage room, Nami kneads Yurina's large breasts and stimulates her manually. Sneaking into the classroom at night, the two use a jump rope to immerse themselves in even more intense play.