Gestalt Vol. 6 (manga)

Ouri and Father Olivier are together again, but they're not about to live happily ever after quite yet. Olivier's nemesis Ender is back, and even the deadliest dark magic may not be enough to slow him down. He's determined to bring Olivier back to his Order and force him to face up to the crimes of his past, but Olivier himself has another plan in mind. His best chance at redemption may be hidden somewhere in the forbidden realm of G.