Sword Art Online: Kiss & Fly, Vol. 2 (manga)

Kirito and the others try to unravel the mysteries of a new quest, traveling to new, unexplored areas of Alfheim Online!! And Yuki, at the hospital in palliative care for her incurable illness, spends her time playing a game for terminal patients called -Serene Garden- by using a medical-grade full dive system called Medicuboid. There, Yuki discovers a new VR game called -Asuka Empire,- and takes her first steps into the world of VR Games. Witness Yuki-s origin, and the birth of -Zekken!-