C198 Expelling ghosts to subdue demons

Although I don't know exactly why this happened, if it has anything to do with the ghost keeper.

If it has something to do with the ghost keeper, then I think we have to find the culprit first if we want to completely solve the problem of the overflowing school.

If we don't find the culprit, there will never be a result.

So I think the best way is to find the ghost keeper first