Trapped alongside ten thousand other players in the virtual world of Sword Art Online, Asuna must learn to survive inside the floating castle of Aincrad, where dying in the game also means dying in the real world. Initially inexperienced, she decides to fight on the front lines and meets Kirito, a former beta tester accustomed to progressing alone. Together, they begin climbing the castle floor by floor, facing formidable bosses, complex quests, and growing tensions among the players. This new exploration of the early days of Sword Art Online follows their gradual progress while developing their relationship and the challenges faced by the survivors.