 If you liked
Jikkyou!! Izumi-kun no Koi Moyou
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 ...then you might like
Jaku-Chara Tomozaki-kun Comic
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These two manga are about the main protagonists expanding their limited world views and social interactions with the help of a girl classmate who uses the protagonists' strong points. In Jikkyou, he uses his emcee-like voice, while in Jaku-Chara, he gets help with ideas relating to the games he plays.
Jikkyou abruptly ended though, so it doesn't have the best ending. Jaku-Chara originates from a light novel so you may want to read that after the few chapters the manga currently has.