Kingdom Hearts x Equestria Girls. Sora travels to a world that holds a powerful magic, which he must protect from the impending Darkness while searching for his lost friend, Riku. Takes place after Dream Drop Distance.
The final battle between Sora and Xehanort was a failure. Sora is on his last legs and his friends have all been captured. When he refuses to help Xehanort, he is sent into darkness. What he finds on the other side surprises him above all else.