Son Ken takes pride in his mother, known throughout the neighborhood as a beautiful woman. With his father away on a business trip overseas, the two are left alone at home. As time passes, Ken finds himself increasingly drawn to his mother's beauty, his feelings growing harder to control. One day, he discovers her cleaning the bathroom in just her underwear. Unable to resist, his eyes fixate on the pubic hair visible through her undergarments, and he finally gives in, overpowering her in a moment of uncontrollable desire. This marks the turning point in their relationship, as the story takes a new and forbidden direction.