Karasu is an angel of the class Powers; Shirasagi is a demon, a Marquis. One day Karasu is assigned to convince Shirasagi to return to Hell. However, Shirasagi doesn't act like a demon at all -- not only is he a priest, but he's forsworn the use of his demonic powers, and wishes nothing more than to live his life as a human. But the Archduke of Hell also has his eyes set on Shirasagi, and Karasu's own deviant behavior soon throws him out of God's favor. Will the pair be able to overcome the restrictions and laws of being an angel and a demon and live their lives freely?
~from SiH
Volume 1 Summary: Part of the angelic bureaucracy, Karasu is sent to earth to retrieve a demon living among humans. However, he's surprised to discover that Shirasagi only wants to throw away his heritage and his powers, and live as a human, and a holy human at that. A priest working out of a bar in the city, Shirasagi teaches children and is generally an all-around wonderful person. But Heaven and Hell both want him back and it's going to be quite a battle.
Volume 2 Summary: Karasu may have retrieved Shirasagi from the clutches of Beelzebub once, but Hell isn't quite ready to relinquish up its claim. However, the appearance of Koumori and Sarugami, an new ally and an old friend, may force our pair to not only acknowledge their debt to each other, but their true feelings as well.
Volume 3 Summary: Koumori leads Karasu and Shirasagi through the wastes of Purgatory, while high above, the Seraphim argue over how best to prevent the Distortion from spreading any further. When the war between Heaven and Hell begins once again, Dominions and Karasu restart their own fight, but soon the Archduke gets involved, and what happens in the end will take everyone by surprise!
