Priest manga volume 5 : Ballad of a Fallen Angel

Vascar De Guillon was once willing to give his life for the cross serving as a knight in the crusades.

His faith was shattered after he lost his wife and children to plague.

Consumed by rage, he made a pact with the fallen archangel Temozarela, becoming his agent in the mortal world and slaughtering countless innocents.

When De Guillon is brought to trial for his sins, the church sends their top priest to serve as prosecutor - Belial Gavarre.

The prosecutor finds himself the defendant when De Guillon uses any means at his unholy disposal in his attempt to corrupt Belial's faith.