[ Nicest con man in all the land, that's a title we give this rat man proudly. ]

Oh, really?

[ Tch, someone who actually knows what they're talking about. Reigen doesn't let it faze him. He's a skilled enough liar that he just rolls with the punches. ]

Even if it's only a partial possession, the presence of spirits can affect normal people in a variety of different ways. Joint pain is indeed most common among adults, but even a child like you could end up with all kinds of nasty side effects if the spirits aren't dealt with.