ZENKI

One thousand years ago, all manner of evil creatures beset Earth. Only the high priest, Ozuno, could control the guardian demon named Zenki and protect the world. Fearful that no one would ever be able to control the destructive Zenki, Ozuno sealed the creature in a stone monument before he passed on. In modern day, a young priestess named Chiaki Ozuno uncovers the monument. Strange demonic objects known as the Seeds of Evil have been appearing once again, and with them come doom for all mankind. Chiaki's only chance is to summon Zenki! Will she find a way to control him, or will Earth's salvation spell her destruction? (Source: Media Blasters) — Description from AniList community (anilist.co).