Mari, Yoriko, Moe, and Michiru are employees of a sauna located somewhere in Tokyo. Their days were busy with cleaning, laundry, and store responsibilities, but the fun of these girls, who were sweating and working hard, was searching for a cock that was ready to cum among the male customers. The girls were searching the changing rooms and bathrooms again today... One day, Yoriko witnesses an extra-large cock. Yoriko rushes to tell the three. The four curious girls force themselves into the sauna where the male customer is in, even though they know it's embarrassing.