Teito Monogatari
English name: Doomed Megalopolis
Genres: Horror, Supernatural
Type: OVA, Episodes: 4
Aired: Sep 27, 1991 to Sep 25, 1992
Studio: Madhouse
Source: Novel
Rating: R+ - Mild Nudity
Synopsis:
When an evil sorcerer bent on crushing the "greatest city on earth" uses dark powers to awaken the destructive spirit of Tokyo's historic "guardian," Taira no Masakado, occultists, children, and scientists become embroiled in a ruinous struggle spanning two decades.

(Source: ANN)