흑형 대물 에게 따먹히는 18살 소녀

Lonely Kosuke is sitting on a bench in the park trying to keep warm. His roommate had kicked him out of the shared house. Then a beautiful lady named Sakura passes by and invites him to stay with her at her place. Her plan is to win him over as a marriage candidate for her stepsister. Before that he however must learn a few sex practices which Sakura and Himeka are teaching him. He appears to be in heaven...