This is a neat little animation about Sword Art Online. It isn't a trailer for an upcoming season or anything like that but was just used as an introduction video for an event. There is no real story but the animation shows the main characters from SAO in their real lives with the Aincrad castle floating in the sky and shows them putting on the nervegear. The animation is in a very different style from the original anime but it does look good. The music/sound and voice acting are all good too. Overall this is just an animation of the SAO characters without a realstory. If you like SAO you'll probably like this animation but don't expect anything substantial.