A story of a dog and a boy but not in the ways one may think. The only things the dog Inugami knows about himself and his past are his abilities to heal quickly, grow blades from his back, and that someone somewhere once told him to watch over humanity. Being surrounded by humans who yearn to capture his powers for their own ulterior motives makes him question what use there is in protecting such a terrible species...until he stumbles upon the young man Fumiki in an abandoned building and becomes his friend.