At just 19 years old, Mai Haruna boasts a youthful figure with 88cm H-cup big tits, drawing widespread attention through this rapidly popular release. The story traces the growth of her breasts from infancy, depicting how they gradually develop through encounters with her father, private tutor, and older brother. Directed by Ohmura Daisuke—known as the protégé of famed director Tamike Goro and a self-proclaimed busty fetishist—this title delivers 120% satisfaction for hardcore fans of extra large breasts, incest, cosplaying, and private tutor themes.