As the earth tremors beneath their feet, rumours of an ancient god called the Majin that lies beneath the rock abound amongst the peasant denizens of a small mountain village community ruled over by the benevolent feudal lord Handabusa (Ryûzô Shimada). When Handabusa is overthrown and slaughtered along with his wife by his treacherous underling Samanosuke Odate (Ryûtarô Gomi), his young son Tadafumi (Yoshihiko Aoyama) and daughter Kozasa (Miwa Takada) flee with their guardian Kogenta (Jun Fujimaki) and seek shelter with an elderly priestess Shinobu (Otome Tsukimiya) who tends to the local shrine to the angry mountain spirit. Shinobu leads them to a secret part of the mountain where an ancient stone idol sits half-buried in the rock. Ten years on and Tadafumi, now a young man, vows to return to his ancestral home with Kogenta to liberate his people from the cruel reign of Samanosuke, while Kosaza prays to the idol for assistance. However, Samanosuke's increasingly violent steps to retain his power eventually lead him into the forbidden territory of the Majin, and the Majin is not going to take such intrusions sitting down... Kimiyoshi Yasuda blends fantasy and historical realism in the same invigorating and seamless manner he later brought to his ghostly yokai period tales 100 Monsters (1968) and Along with Ghosts (1969).