I was ordered to search for a saint, but...

Yuna, who works as a nun at a church, is one day ordered by her superior to search for a saint. There's a possibility that a demon king will appear in the near future, and a saint with the ability to seal the demon king is needed. Yuna left the church, but she thought to herself: "Isn't this just a nice way of kicking me out? Well, then I might as well take my time and enjoy it." Yuna felt no sense of urgency. And that's because...