Mizuki, a senior, and Ena, a junior, are two good friends living in the same girls' dormitory. Mizuki is at the mercy of Ena's devilish pranks, which begin by chance, and her hidden masochistic nature is brought to the surface. After that, Ena takes Mizuki around after school, and as she spends her time as her lesbian slave, her body and mind are saturated with lesbian pleasure. A secret master-slave relationship, this is the form of our youth...