Son-Goku is a monkey who was born from a stone and is endowed with magical powers. He gets carried away and goes on a rampage until at last Buddha confines him within Mt. Gogyo. Saved by Sanzohoshi, Son-Goku accompanies him on a journey to India. But on their way, monsters lie in wait for them.

During a dark time in the Heian period, when evil forces threaten the kingdom, the emperor relies on the onmyōji to keep the supernatural forces in line. But as political events become highly charged, friction within the order leads to betrayal. Now, Seimei, a talented member of the clan, must face down his master, Dōson, in the hopes of restoring peace to the kingdom.