Arifureta: From Commonplace to World's Strongest Zero Vol. 5 (manga)

HOLY WAR ON THE HIGH SEAS

Miledi and her fellow Liberators sail the high seas around Andika, a free island city rife with pirates and outlaws. Their goal: Recruit the notorious Captain Meiru, leader of the Melusine Pirates. Famed as the Saint of the Western Seas, Meiru's ancient magic would be of great help in the struggle to end the tyranny of the Holy Church and the mad god they worship.

But the Church isn't about to let the alliance stand. A powerful detachment of the Church's most elite Templar Knights is on their way, determined to mete out divine punishment on all unbelievers.