In the hallowed halls of Sei Dorei Gakuen, two timid students, Yumi and Mai, find themselves initiated into the secret, kinky traditions of their school. They are led by the seductive sensei, Akari, to a dimly lit chamber adorned with erotic artwork. The girls, clad in their sailor uniforms, are guided to sit on a plush, red cushion. Akari begins to undress, revealing her luscious curves, and commands the girls to touch each other. Yumi tentatively reaches out, her small hand cupping Mai's breast, as Mai's fingers trail up Yumi's thigh. Akari watches, her eyes gleaming with lust, as she guides the inexperienced teens through their first lesbian encounter.