Three years into her marriage, Kyoko began to notice her brother-in-law, Masaru, making advances toward her. Sneaking glances when her husband wasn't looking, he recently started groping her voluptuous body whenever her husband stepped away, even just to use the bathroom. At first, Kyoko ignored him, but gradually she became aroused by his touches and found herself drawn to him. One day, their neighbor Mr. Ozawa, who had long suspected the affair between Kyoko and Masaru, took advantage of her husband's absence and made his move on her. Just then, her phone rang—her husband saying he'd forgotten something and was coming back immediately—sending tension soaring.