Teito Monogatari
English title: Doomed Megalopolis
Japanese title: 帝都物語
Type: OVA
Episodes: 4
Source: Novel
Genres: Horror, Supernatural
Studios: Madhouse
Producers: Toei Video, Streamline Pictures
Duration: 42 min per ep
Rating: R+ - Mild Nudity

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)