Although Kirito cleared SAO and returned to his real life, his adventure was far from over. Asuna is in a coma in the hospital, and Nobuyuki Sugou of RECTO, the company that took over SAO's property, is trying to get married to her! Hearing that Asuna has been spotted in the virtual game Alfheim Online (ALO), Kirito decides to dive into the virtual world once again. With the help of Leafa, Kirito rushes to the World Tree where Asuna is supposedly imprisoned.
Sword Art Online Vol. 3 Fairy Dance Part 1 (Eps 15-19)
Welcome to Alfheim Online