After divorcing her husband, Natsumi and her only daughter Kyoko started living in an old house. However, a few days after moving in, the bathroom broke down. It was summer, and the sticky feeling on their bodies was unpleasant, so Natsumi and Kyoko headed to 'Sennyo-yu,' a women-only public bath they learned about from a newspaper delivery person. But at Sennyo-yu, for some reason, Natsumi was directed to 'Shirayuri' instead. There, Natsumi met Natsu. At that time, Natsumi had no idea that 'Shirayuri' was actually a 'lesbian-only bath'...
