The 'Sakura' Kirishima family and the 'Hayama' Tachibana family had a tradition of arranging betrothals for their children for generations. Accepting this custom, Sakura, upon realizing that Hayama, who was younger than her, had an interest in the female body, allowed him to touch her voluptuous G-cup breasts and to caress her crotch. Then, the next day, the two of them experienced an overly premature first night...