 If you liked
Chuunibyou demo Koi ga Shitai!
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 ...then you might like
Musaigen no Phantom World
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Both are KyoAni adaptations of light novels, the character designs and tone are very similar. In both the characters experience delusions in which they must defeat a force threatening their world and form a club to fight against it, these fights are very detailed with similar choreography in both. The major difference in Phantom World is that these delusions are real.
Both series share seiyuu for the main heroines which are Maaya Uchida (Rikka/Koito) and Sumire Uesaka (Dekkomori/Mai).