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Well, to my understanding, a host club is a place where women can designate different handsome men - hosts - to sit and charm them, basically. Hosts light their customers' cigarettes and do fancy lighter tricks, pour them drinks, sing karaoke, and I think it's really like paying to flirt. They're kind of seedy, actually...
I'm a little confused by this one, though - the two hosts in it I've spoken to have said it's different than that. Those are "vulgar commoner" host clubs, apparently! This one seems very high-end, and there's no smoking or drinking, the king said. It was a school club. So I would ask him personally about what that would mean for you as a host.