I've been watching an anime named Log Horizon recently. It's similar to Sword Art Online in terms of concepts in that the characters basically get "sucked" into the world of a video game, but in this circumstance, they're actually transported inside, rather than simply being trapped as data - as if the game world is a true reality now. Even the NPCs now act like humans and have personalities and backstories. What I like about Log Horizon is that there is no clear objective, unlike SAO, so even side stories such as the one I plan to do involving a small, newly created guild and it's adventures actually has some point to it. If you want more details about the universe, either look at the wiki or ask and I can describe it myself. A lot of how it functions is similar to a typical RPG game though, such as having classes and skills.