Since Emperor Kanmu moved the capital to Kyoto (Heian-kyo) from Nara, which was full of powerful forces, Japan officially entered the Heian era, and the new capital was named "Heian-kyo", which means peace and tranquility.
But it seems that God does not want Heianjing to be as safe as its name suggests. Since the city was moved to the capital, monsters have often come to harass it, so a group of onmyojis have emerged who subjugate demons and draw astrological symbols.
And in the God Realm, Gaotianyuan, there seem to be a few gods who have an extraordinary interest in the human world...
The mobile game "Onmyoji" is a fanfic, the main character is an original character, and it is not a time travel.
New author, please bear with me.
(^-^)
Concept: Onmyoji mobile game characters interspersed with doujins