Occult detective Inugami travels to a rural village to investigate a case. There he finds the half-human boy Kabane, who wants to find his parents.

The people of the kingdom look down on the young Prince Bojji, who can neither hear nor speak. They call him "The Useless Prince" while jeering at his supposed foolishness.

Inspired by a championship match he sees on TV, junior high schooler Hinata joins a volleyball club and begins training, despite his short height.

With demons reawakened and humanity in turmoil, a sensitive demon-boy is led into a brutal, degenerate war against evil by his mysterious friend, Ryo.