 If you liked
K-On!: Ura-On!
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 ...then you might like
Shingeki no Kyojin Picture Drama
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Both are short specials, made as spin-offs of original series. Both have chibi-styled characters and are based mainly on comedic dialogue. Both are comedies and both have short episodes. Difference is that Shingeki no Kyojin Picture Drama comes froum shounen anime while K-On: Ura-On comes from slice of life anime.