A story of erotic experiences of a boy who was left in the care of a relative's mother at a young age. After losing his mother, Mitsuo lives with his father, but when his father gets busy with work, he is taken in by his relative Yuri. Meeting Yuri for the first time in a long time, Mitsuo, who is just starting to become aware of things, is strongly attracted to her beauty. When Mitsuo witnesses his son fawning on Yuri's breasts, his crotch throbs and he begins to approach Yuri relentlessly. While making dinner, he squeezes Yuri's huge breasts from behind, and when they take a bath together, he plays with Yuri's genitals in front of his son. And before he knows it, their relationship crosses the line... This is a sensual erotic drama that is sure to get you hard.