In What Era Were Old-Fashioned Exorcisms Still Used?

"What? You said you blew up your little life?" "Well, it's a pity about that Mount Fuji." "Is this about Shan?! Such a serious matter... You didn't take a video!" Mei Shuzi was accidentally exiled to this world because of something, but he soon discovered that the place of exile seemed to be wrong. He was exiled to an island country in a world where demons and monsters were rampant. However, he learned from other people that this was not the case at the beginning. It all started because of the red moon that shattered the sky a hundred years ago...