Sword Art Online: Kiss and Fly, Vol. 2 (manga) — Reki Kawahara

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!”