 If you liked
Watashi ga Motenai no wa Dou Kangaetemo Omaera ga Warui!
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 ...then you might like
Chio-chan no Tsuugakuro
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Similar emphasis on second-hand embarrassment as a source of comedy, with the two main characters of Chio-chan no Tsuugakuro both sharing certain personality traits with Tomoko from WataMote.
Both Chio and Tomoko deal with awkward social situations, which are often caused by them overthinking or overreacting to certain things.