S01E01 Onmyou
Within the capital, there are rumors of evil spirits causing mischief in the night. Among those spirits hide creatures from Makai called Horrors that feed on humans. It is up to Makai Knights and Alchemists...
Raikou fights a Horror that absorbs light and gets the light of the Golden Armor stolen from him. After eliminating the Horror, Seimei and Kintoki quickly realize that Raikou is still affected by the darkness that seeped into Zaruba and his armor.
Heian-kyō, capital and the center of elegant, aristocratic culture, is heavily guarded by a spiritual force field -- or so it seems. In reality, onmyōji (court magi who create the spiritual force field) can only defend the palace located in the northern part of the city; in downtown, monsters known as "horror" that feast upon human souls roam after sunset. There are, however, a group of heroes protecting commoners from "horrors" in darkness.