It's set in the world of Sword Art Online but a long time later, so it is it's own show but is kinda like SAO still which is good.
A far cry from SAO. Uses the same sort of theory as sao but is soo much worse. the story isn't as interesting and the lead up is just quite boring. The fights don't really have that much action in my opinion. However the casual relationships were quite interesting, would they get together who knows?