The Strongest Priest: There's Nothing Wrong With Wielding a Hammer, Right?

He died in a car accident and was given a chance to start anew in another world, he chose to bring his little sister along. But upon arriving, his sick sister was transformed into a black cat by a mysterious curse. Now, the only way to turn her back into a human is to accomplish one impossible task: Slay the Demon King. [Original Webtoon](https://www.kuaikanmanhua.com/web/topic/28066/)