Sword Art Online :
Sword Art Online is a Japanese light novel series, later adapted into an anime, that explores the concept of virtual reality MMORPGs. The story centers around Kazuto “Kirito” Kirigaya and Asuna Yuuki, who become trapped in the virtual world of Sword Art Online, a game where death in the game results in actual death. Their struggle for survival and escape from the game becomes the central plotline.