The War Of The Magai

When a war between the four clans of the Magai threatens to destroy the peaceful living in the Makai, what will the Reikai Tantei do? What happens when one of their members actually turns out to BE one of the Magai? Who is the Magai hiding among them and what will his true form turn out to be? Will the Reikai Tantei help the good Magai stop the war, or will they sit on the side?