Sword Art Online, (Light Novel) Vol. 03

Kirito has escaped Sword Art Online, the forbidden VRMMORPG of death, and returned to reality. He heads off to find his game partner and lover, Asuna Yuuki. But Asuna never made it back from the nightmare. Lost and desperate, Kirito's only clue to her virtual whereabouts is a mysterious screenshot of Asuna as a fairy trapped in a giant birdcage.