Kingdom Hearts III: The Novel, Vol. 1 (light novel) Re:Start!!

After losing his strength in the Mark of Mastery exam, Sora sets out on another quest with Donald and Goofy to find the Power of Waking before the final clash with Master Xehanort. Meanwhile, Riku journeys into the realm of darkness to find Aqua, beginning the search for the rest of the seven guardians of light, and Kairi and Lea continue their training. The final chapter of the Dark Seeker Saga is about to begin!