Tired of spending a life studying to reach an empty future, Asuna enters Sword Art Online, a world of swords and airships, to gain some measure of freedom. When she is trapped, she throws herself into building a new life for herself, as far from what her parents intended as she can. Meeting a dark swordsman sets her on a new course, in Aincrad's skies...

After the brutal 25th Floor Boss Raid, Asuna has left Kirito's side to join the Knights of Blood. With his partner gone, Kirito resigns himself to returning to the life of a solo player-until a familiar face from the lower floors unexpectedly reenters his life. The strangely-human NPC Kizmel, despite her quest being over, has returned to his side... Kirito/Kizmel.