In 2022, humans have achieved the fusion of the real world and the imaginary space, and electronics manufacturers have developed an online video game called "Sword Art Online". SAO was well received as soon as it was released, and the limited number of 10,000 copies was sold out in a short time on the day of release. Through the Internet, players can immerse themselves in the game world full of imagination and exotic style-the floating city of Aincrad. Players can live, practice martial arts, upgrade, do business, and explore here, which is no different from the real world, but has supreme fun. Kirito (voiced by Yoshitsugu Matsuoka), who was once a few closed beta players, is also one of the 10,000 lucky ones. After the initial excitement, the players found that they could not log out of the game smoothly. What's more terrifying is that once the player's HP is zero, their bodies in the real world will also die. They are trapped in the game by SAO's developer Akihiko Kayaba (voiced by Koichi Yamadera), and there seems to be only one way to escape smoothly, that is, to complete the difficult strategy tasks... This film is adapted from Kawahara Reki's light novel.