This book begins 500 years after the green-headed old monster, a mackerel demon, was crushed beneath a meteorite in the Celestial River by the Tathagata of the Western Heaven. Chang'e then rescues him. The green-headed old monster returns to the world, subdues demons, and does whatever he pleases. This enrages the Celestial Court, and the Jade Emperor sends an army to destroy him. The green-headed old monster then battles the gods, but in the end, the Tathagata of the Western Heaven subdues him once more and buries him in the Celestial River again, never to rise again.
