Sword Art Online Re:Aincrad, Vol. 3 (manga)

After saving the Moonlit Black Cats, Kirito is drawn to their warmth and camaraderie which persists even in the bleak world of SAO. He sets aside the label of “Beater” and joins their ranks. With Kirito’s help, the formerly weak guild makes quick progress and starts wanting to join the front line. But one night, Sachi, the guild’s only female member, suddenly disappears. Kirito rushes out to find her, knowing how afraid she is of death.