 If you liked
Ouran Koukou Host Club
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 ...then you might like
Junai Host Club
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Junai Host Club is perfect if you want a shorter, but more mature version of Junai Host Club. As the titles suggest, both series are set predominantly in a host club and both have quite attractive-looking characters in them, but Junai is much more mature in themes than Ouran.
Junai also has additional non-related one shot stories too, but these are just as nicely written as the story of Junai Host Club itself.