Yui lives with her daughter, son-in-law, and husband. It's a peaceful family, but one day, Yui's underwear is stolen! 'Who would want this old lady's underwear...' Yui feels creeped out, but the culprit turns out to be her son-in-law! He had been captivated by Yui's large breasts from before and finally unleashes his desires, attacking Yui! Unable to resist due to her own frustrations, Yui is toyed with by him...
