After marrying Hiro, her former coworker, Yui became a full-time housewife living with her husband's father, Tohru, in her in-laws' home. Whenever her husband left for work, Yui was left alone with Tohru. Her sweet, gentle demeanor stirred forbidden desires within him. The sight of her breasts swaying in front of him, the outline of her panties visible beneath her skirt, and secretly catching glimpses of his son and daughter-in-law's intimate moments drove him to the edge. Overcome by impulse, Tohru pinned Yui down and began violating her body daily. As this pattern continued, Yui's feelings slowly began to change...