Tired of the hustle and bustle of the city, beautiful wives go on a short trip alone and are attacked in their sleep, but contrary to their words, their pussies get wet. On a night after refreshing herself at a hot spring, the lust that she had forgotten due to the busyness of her daily life is awakened by her husband's caress, and she falls madly in love with a penis other than her husband's. The spring water overflowing from the woman's body wets the futon and tatami mats.