Natsumi divorced her husband and started living in an old house with her only daughter, Kyoko. However, a few days after she started living there, the bath in her house broke down. The season is summer, and feeling uncomfortable with their sticky bodies, Natsumi and Kyoko head to the "female-only sento, Senjou," given to them by the newspaper delivery man, but... However, for some reason, Natsumi is passed through to "Shirayuri", which is different from Kyoko's for some reason. There, Natsumi meets Natsuko. At that time, Natsumi still didn't know that "Shirayuri" was a "bath for lesbians".
