Ardbert was drawn into a world that is nothing to which he travels. Instead of looking for answers, he will have to deal with those who threaten to conquer. He must defy the laws that persecute him to protect those around him, or lose them as he once did to his.

One day on a chilly December, Kamijou Touma and the others are planning to go to a family restaurant, however they stop at an event that hosts a beta testing of the newest game called 'Legend of Astrum', an VRMMORPG. Index gets tempted to play it and they 'luckily' were chosen to be one of the beta testers. Thus they log in...but later they notice it. They cannot log out anymore.