Kagetsuya and Chihaya are angels from Eden who've been tasked with investigating humans, otherwise referred to as Earthians. Kagetsuya reports the negative side while Chihaya takes care of the positive side. But something has always bothered Chihaya -- for his wings are black... unlike the rest of the angel populace. Chihaya is prepared to risk anything, including the possibility of becoming a fallen angel, just to find out the truth. (Credit to Animetric.com) <br />