This procedure doesn't always work as intended though, and to his chagrin, Satan discovers that his latest son Morael had been installed in the body of a mentally deficient human host from whom he can learn very little. To correct this error, Satan installs a new and much improved mind in Morael's host's body to complete his proper education.The story follows the lives of the people affected by this rectification until Satan considers his son worthy and fully ready to perform the tasks bequeathed him by his birthright.