The Other World's Books Depend on the Bean Counter, Vol. 5 (manga)

Tasked with investigating the church, this intrepid bean counter must somehow survive not just the potential political intrigue going on behind the scenes, but also the very air around him! Since magic itself is toxic to Kondou, stepping into a place so inundated could be considered a death sentence…! What’s worse, his dashing knight captain, Aresh, gets called away to deal with a dangerous magical beast…