Teito Monogatari is an epic historical dark fantasy/science fiction work; the debut novel of natural history researcher and polymath Hiroshi Aramata. It began circulation in the literary magazine Monthly King Novel owned by Kadokawa Shoten in 1983, and was published in 10 volumes over the course of 1985–1987. The novel is a romanticized retelling of the 20th-century history of Tokyo from an occultist perspective.

Onmyōdō is a system of natural science, astronomy, mantras, almanac, divination and magic that developed independently in Japan based on the Chinese philosophies of yin and yang and wuxing