Arifureta: From Commonplace to World's Strongest Zero (Manga) Vol. 6

Armed with ancient magic and all the authority of the holy church, Laus Barn led his ruthless Templar Knights to try and subjugate the free pirates of Andika. Faced with their overwhelming power, pirate captain Meiru decides to cut a deal. In exchange for a payout, the church will look the other way and allow her to rule Andika...but there's one big catch. The thing the church wants most of all is possession of Meiru's little sister, and the magic she commands. With the Liberators, pirates, and church all converging on Andika, the stage is set for a dangerous confrontation!