Oni was led to his future pack's home by a mysterious glowing blue flame, which brought him to a dark cave with a hole in the ceiling to let in moonlight. When the full moon hit him, the blue flame sank into his fur and infected him with the Moon Spirit. Every full moon, the demon inside him grows too strong to contain and rampages wildly, destroying anyone in its path. The rest of the pack hides in terror, sure that their leader-deity will tear them apart if he... it finds him.