 If you liked
K-On!
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 ...then you might like
Kono Bijutsu-bu ni wa Mondai ga Aru!
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K-On! and This Art Club Have a Problem are similar in their ways. Although K-On! is more corny and has less romance than Art Club, they both take place in a club room after school, having similar comedies, but Art Club is kind of funnier, and both anime have a hot supervisor. The 2nd season of K-On! is better, but watch the 1st season to understand what's going on. 2nd season is also funnier. But anyway, if you liked K-On! then I would recommend Art Club.