Sword Art Online Kiss and 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 Yukis origin, and the birth of Zekken!