A group of demons in the ancient Japanese capital of Heian is dismembering members of a family of Japanese nobles.

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

An original story telling how Abe no Seimei became the most powerful sorcerer in the age before he became an Onmyoji.

Kyogokudo is a used book seller who doubles as an onmyouji, or Heian style occultist. His friend Sekiguchi brings him the story of a woman who has been pregnant for twenty months. Sekiguchi investigates further with the help of his friend Enokizu, a detective with the unusual ability to see people's memories. They are hired by the impossibly pregnant woman's sister to find the woman's missing husband and lay this whole matter to rest. In the end, they need the help of Kyogokudo to exorcise the family curse.