If you liked
Suzumiya Haruhi no Yuuutsu
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...then you might like
Ameku Takao no Suiri Karte
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Considerably-autistic and hyperactive cute tsundere girl decides to constantly trouble the male main character to solve mysteries and do things that most people wouldn't even consider doing. Trust me, you're gonna love these if you like it when the main character is adorably obnoxious.