Gil and Ernie live in Debris City as delivery boys; Gil, (human x bone...? mix) takes charge and rides on Ernie (human x motorbike mix). Even though they're outcasts, they still live a reletavely peaceful life.
However, a hunt for Mixes suddenly begins, and the two find themselves on the run. The mafia attacks, and just when they're about to be hit... Pug-hand appears with his wings spread like an angel and defeats the mafia! Despite his ferociousness, he quickly becomes attatched to Gil and his bones.
While living as the mafia's targets, they look for the answer to "what it means to be a Mix". Is there any way to return to their "original" selves? A chaotic, violent, and comedic action story by Satou Yuuki!