 If you liked
Net-juu no Susume
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 ...then you might like
Jaku-Chara Tomozaki-kun
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Both characters meet offline after meeting inside a game first and end up socializing and eventually getting a girlfriend/boyfriend and changing their lives for the better! Both animes sort of have characters with a 'hikokomori' lifestyle (a person spending most of their time locked up in home playing games and such)