Rather than a castle floating in the sky, Kayaba Akihiko has created a world where the dead refuse to stay put in their graves. Players fight to reclaim Aincrad, a massive city spanning 100 districts, from the grasp of the undead. But when they find themselves trapped in this nightmarish world, zombie-hunting ceases to be all fun and games. Welcome to SLD. Follows Kirito and Sinon.