Sword Art Online 15 (light novel): Alicization Invading (Volume 15)

Adminstrator's defeat has come at a heavy cost: The death of Eugeo as well as the mental decline of Kirito. Six months after the epic battle atop Central Cathedral, Kirito spends his days in the Underworld wheelchair-bound; bereft of emotion or even a will to live. Although Alice and Bercouli do what they can to help him, it isn't long before the armies of the dark territory are start to move in earnest. The "Final Stress Test" has begun. But will Kirito be ready?
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After the school fair ends and summer begins, Team Enfield starts special training to prepare for the five-against-five Gryps. Ayato and his friends are a favorite in the competition, but Galaxy is about to make its move...