In ALfheim Online, Lisbeth, Silica, and Leafa decide to embark on an adventure without Kirito, taking on a quest whose reward is a magical ring that allows people to communicate over long distances. Their mission takes an unexpected turn when they encounter particularly powerful monsters and a mysterious black-clad swordsman who bears a striking resemblance to their friend. This meeting draws them into a story connected to the lasting trauma of Sword Art Online and the difficulties faced by some of its survivors. Confronted with new dangers, the three young women must combine their skills, build their confidence, and help someone still haunted by the past.