After her husband's passing, minori becomes a widow. Her two stepsons, who were once her husband's children, have grown up, and the three of them, who were originally close, have become even more united and supportive of each other. As she relies on her sons, the stepmother begins to see them as men. The sons, too, develop feelings beyond motherly love for their young, beautiful, and well-proportioned stepmother. One day, their relationship becomes strange and goes beyond that of parent and child.
