Yuki and Asuna are always together! Their love keeps them bound together always!! I am not sure how but I know their love allows them to be together in the virtual world and Yuki even knows how Asuna is doing in the “real” world!
Maybe I am just a foolish person p..
^The video is based on an official short novel. Don't know if it's as subtexty as the music video though, since as far as I know it hasn't been translated.