Kadono village's shrine maiden has a guardian every generation. During Edo period, guardian Jinta confronts a demon foretelling a future Demon God's rise tied to their era. His quest to prevent this spans centuries.

Betrayed and on the brink of death, genius exorcist Haruyoshi Kuga still has an ace up his sleeve—a reincarnation spell. With a successful incantation taking him to a new world reborn as Seika Lamprogue into a distinguished wizard family, his only wish is to find happiness. But as Seika’s onmyō art exceeds this world’s magic, will he be able to live an easy, happy-go-lucky life?