The Kirishima family of "Sakura" and the Tachibana family of "Hayauma" have had a custom of marrying children for generations. Sakura accepts the custom, and when she notices that Haruma, who is younger than herself, is interested in women's bodies, she makes her touch her G-cup breasts and caress her crotch. And the next day, the two of them will have their first night too early...
