About three years after she married her husband, her brother-in-law, Katsu, began to make advances on Kyoko. When her husband wasn't looking, he would often play with Kyoko's voluptuous body, even when her husband was out to the bathroom. At first, Kyoko ignored him, but before she knew it, she was hooked on the excitement... One day, Ozawa, a neighbor who had been spying on Kyoko and Katsu's affair, finds out that Kyoko's husband is out and makes advances on Kyoko. Then she gets a call from her husband, who says he forgot something and will be back soon...