You Promised to Fight the Devil, Why Is This Such a Ghost Thing?

Oakfield originally accidentally came to the fairy world from modern times to study, but was accidentally borrowed by a great power. He was picked up by a god to help that god to achieve great results and defeat the devil. However, due to some force majeure factors, the devil did not see it. Instead, he saw a bunch of strange things. "Anyway, you have studied in other worlds and are much better than others, so the difficult task of defeating the Demon King is left to you." "Huh? Why should I fight the devil?" "Yes, I believe that as a top student in the fairy world, this kind of thing is a big deal for you." "No?" "I believe you and I will wait for your good news." … "Where is the promised devil? Why is this kind of ghost?" "Friend, you look familiar..." "You... You recognized the wrong person" "Really?"