About an hour from central Tokyo, a young man named Daisuke owns a home he bought early in life. His wife invites her mother, Midori, from the countryside to visit the city for sightseeing. What begins as a simple three-day, two-night stay gradually transforms into something more intimate. Midori's mature, voluptuous figure—especially her lush, alluring hips—stirs something deep within Daisuke, awakening desires he can no longer suppress. As her presence becomes part of his daily routine, the emotional and physical tension between them grows, blurring the lines of family and forbidden passion.