 If you liked
Mahoromatic: Automatic Maiden
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 ...then you might like
Suzumiya Haruhi no Yuuutsu
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Both series have the vibe of an endless summer (particularly season 2 in Haruhi's case). In their sequels they acknowledge the happiness and wonder that can be found in this warm, ideal period of youth while also suggesting forward progress as opposed to escaping from responsibility.
The two shows heavily utilize 2000s otaku imagery, as studios Kyoani and Gainax are known to do.