Masahiko, a husband, decided to visit his wife's parents' house. There, Masahiko was Kokoro by his mother-in-law Minako's voluptuous breasts. "I can't help but be drawn to my mother-in-law's melon... no, watermelon-like breasts!" Her obscenely large breasts drove Masahiko crazy, and his desires made Minako, who was used to an ordinary life in the countryside, burn with passion...