Unless I'm mistaken, she's the manager, or mamasan. I doubt if you saw the girls you would pick her, unless your preference is for older asian women who dress frumpy. They had a time a couple of years ago where all their girls were... less than enticing. I went and declined the 3 girls available and she asked if I wanted her instead, with a confused look. I declined that too.
But who knows, maybe she is the greatest fuck of all time and everyone is missing out.