Kyoko and Yuko came to a hot spring alone because their husband couldn't go. As soon as I entered the open-air bath and touched each other's huge breasts and fooled around, two men suddenly entered the open-air bath. Hurriedly hiding her plump body and trying to leave, Kyoko accepted the invitation because her husband was disgusted when men recommended bath liquor. And the four men and women, who are moderately intoxicated, generously pile up their bodies in the open-air bath they have just met.