Kazuto Kirigaya (桐ヶ谷 和人, Kirigaya Kazuto), born as Kazuto Narusaka (鳴坂 和人, Narusaka Kazuto), is a fictional character and the protagonist of the Sword Art Online series of light novels written by Reki Kawahara. He is more commonly known by his portmanteau, Kirito (キリト, Kirito), his player name in the eponymous video game which the novels are partially set in.