Kousoku Angel Engine

In this story, there are angels, devils and humans in the world. Humans are the most abundant, followed by angels with an elitist complex and devils who are a threatened species since they have been hunted down by angels. The story begins with the angel Sumire being hunted down by his friend Renji, a devil. Renji decided that in order for the two of them to understand each other, he will now become the hunter and he cuts off one of Sumire's wings so that they are the "same." The two make a vow to go off hunting other angels—Sumire to replace the wing that he lost and Renji so he won't get hunted (and to get cash so he can buy more Dekavita—energy drink). The two go on to hunt down angels, breaking the long-standing law of angels hunting down devils (and humans on occasion).