Aw Man! I was really hoping for Vampires!

The land of the living has now turned into the land of the dead. The once bustling streets of well known cities are now ghost towns, the atmosphere bone-chilling. An unfortunate teen by the name Kageyama Tobio is stuck in the middle of this mess, all in his lonesome. Fortunately, a gang of crows happen to stumble upon him. He has no idea if this is a gift from God or bribery from the Devil. Even if the flock of dangerous birds was the Devils doing, it was still an opportunity, and opportunities only show themselves to those who are ready.