When Kyuuta, a young orphan living on the streets of Shibuya, stumbles into a fantastic world of beasts, he's taken in by Kumatetsu, a gruff, rough-around-the-edges warrior beast who's been searching for the perfect apprentice. Despite their constant bickering, Kyuuta and Kumatetsu begin training together and slowly form a bond as surrogate father and son. But when a deep…