Yui lives with her husband. She is sickly and is treated by Associate Professor Sagawa, a renowned doctor at the university hospital where her husband works. However, before she knew it, she and the professor began an affair. Although her condition had improved considerably, she continued the affair without her husband's knowledge. The two gradually became addicted to the harsh torture of ropes and candles. One day, after her husband had gone out as usual, Yui welcomed Sagawa into her home. However, that day...