The story centers on Hideki Nishimura, a young man who confessed to a person he thought was a girl online, only for that person to turn out to be a boy. He keeps this "black history" secret and swears to never to trust a "girl" online again. However, one day a girl online confesses to him, and it turns out she's actually a beautiful girl named Ako Tamaki. 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 his guild decide to work together to "correct" her.
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(Source: Anime News Network)