Ten thousand players wake up trapped inside Aincrad, a hundred-floor floating castle where death in the game means death for real. Kirito, a solo player and beta tester, crosses paths with Asuna, a rapier duelist balancing survival with keeping her party alive, as the pair pushes toward the upper floors and a way out. This manga rebuilds the original Aincrad arc from the first two light novel volumes plus short stories no earlier adaptation covered, working through the climb floor by floor without skipping ahead.