Momoko visits the house where her adult son Yuta lives while continuing his education. Reassured that his roommates Goto and Tanabe seem like decent young men, she offers to cook dinner while Yuta is at work. Aroused by her sensuality and pliable nature, they suggest a king's game, manipulate her into joining, then pin her down and use her body as they please. Unable to resist pleasure she has not felt in years, Momoko tells herself it was a one-time mistake, but the two men have no intention of stopping after their first taste.