 If you liked
RealPG
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 ...then you might like
Tate no Yuusha no Nariagari
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Just like SAO and some other series, mangas and novels, this 2 are about virtual reality online role playing, the lives of the protagonist in them and the dangers they have to face. The only difference is, Tate no Yuusha does not only show a more promising plot, until now, it has also been the most fun to read.
It wouldn't amaze me to see this manga animated next year, and gaining the same amount of popularity as SAO.