3 months had passed since the Tall Titan was destroyed and peace was brought back to Courage Island. But Glation escapes from the Towers of Courage and the C.I. Gang returns to do whatever they can to bring him back.
After Kirito rescues Asuna from ALO, she goes though recovery and rehabilitation. Once she gets out, they and the rest of the gang go back to the world of virtual reality, and, another threat is awaiting Kirito and Asuna. (slightly mature content)