Innocent Bird Volume 3: (Yaoi)

Karasu arrives in purgatory with Shirasagi while the angels decide how to deal with him. While a war between Heaven and Hell soon begins, Dominions and Karasu start their own fight and the Archduke soon gets involved. What happens to the Archduke and Dominions? Karasu also makes the ultimate sacrifice for Shirasagi - what is the result?