Sakura Kirishima married a man much older than her, becoming the stepmother to his son, Taishi, and began living with him. Every day, as she went about her chores in an unguarded manner, Taishi found himself increasingly drawn to her. Her braless chest swayed freely, and the deep cleavage peeking through her clothes held his gaze captive. Unable to resist his desires any longer, Taishi initiates a physical relationship with Sakura. Their actions pull them deeper into a forbidden affair, and their intense emotions and impulses begin to drastically alter the course of their lives.