Asuna Yuuki, excelling both academically and socially, prepares diligently for her high school entrance exams. When her friend Mito urges her to take a break and explore Sword Art Online (SAO), a cutting-edge virtual reality game, Asuna joins in. However, their excitement turns to horror as they discover they are trapped in SAO along with all the other players. To escape, they must conquer all one hundred levels of the game, but failure means real-life death. With SAO transforming into a deadly virtual prison, Asuna, alongside fellow gamers like the skilled swordsman Kirito, must navigate this treacherous world, battling not just monsters but each other in a fight for survival and freedom.