"I'll teach you.... good things" Sexual lesson taught by my cousin. Turning my body into adult body by touching it, he took my first time in front of my mother!? By the cousin whom live next to her house, Akito, is tutoring Yukino, who longs for Akito, who has a sadistic side, and one day he begins to teach her about adult lesson!? Yukino who learned about pleasure through the training, the day has finally come for her to lose her virginity.