Netoge no Yome wa Onna no Ko Janai to Omotta

Nishimura Hideki is a young man who once confesses to a person he thinks is a girl online, only to find out that the person is actually a boy. He keeps this story secret and swears he'll never trust a girl online again. However, one day a girl online confesses to him, and it turns out she is actually a beautiful girl named Tamaki Ako. Ako cannot tell the difference between the online world and reality, and she is a loner who has trouble communicating. Hideki and his friends from the guild decide to work together in order to help her.
from ANN
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Notes

Alternative Names: Netoge no Yome wa Onna no Ko Janai to Omotta?, And you thought there is never a girl online?, Did you think your wife in an online game was not a girl?
Author: KINEKO Shibai
Artist: Hisasi
Genre: Action, Comedy, Ecchi, Romance, School Life, Slice of Life
Demographic: Shounen
Adapted into the anime, Netoge no Yome wa Onna no Ko Janai to Omotta