Esper Wing Chronicle

Ok, it seems that God isn't too happy. 15 years ago one of his angels and a devil from the underworld got together and had child twins by accident. Whoops. These children were born with angel and devil powers, becoming dubbed the Demi-Children. The Demi-Child with Devil powers; Cain Abel is the one God wants dead, and Satan plus the Devils in the Underworld don't seem to give a damn about which seems odd... Due to these circumstances, Cain isn't even aware he has a twin sister since they were separated at birth and seldom had to fend for themselves. Cain was raised by a gang of street thieves until they were locked up by local authorities, leaving only Cain.
Anyway, our tale begins with Cain accompanied by his rather eccentric companion; Breeze Pueblo as they started searching in the nearby forest for materials and resources for the lab base so they can begin to learn more about Cain's past and go on a journey of discovery. Meanwhile God has sent one of his specials down to deal with Cain in-person. It seems God is somewhat prejudice towards Devils...