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Modern Japan where the number of public baths continues to decrease. Meanwhile, there were four beautiful sisters who run a traditional public bath inherited from their parents. Their cheerful and healthy work attracted customers' liking, and sales doubled and prospered. They had a secret that no one knew. That's because they are lesbians, and if they have free time while preparing to open or close the store, they are sisters and have sex with them! We approach the secret of these four sisters!