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One day, Yui, a part-time housewife, was persistently invited by a female friend and couldn't refuse, so she went to a place called "Muscle Bar". "Muscle Bar" is a place where customers are served by young, macho men who strut around half-naked, showing off their well-trained muscles. Yui is not sure where to look as she is served. Although she is confused, she can't help but get wet when she sees the men's macho muscles...