This one gets its hooks in you the second the paperwork stops mattering. It looks like a procedural, ability users logged and managed by the Deviant Control Bureau, until Xuan Ji digs up something the Bureau's filing system was never built to contain: Sheng Lingyuan, an emperor who has been dead long enough to find modern authority genuinely funny. That's the engine here, a civil servant with fire in his hands arguing with a millennia-old sovereign who remembers when the rules were written and by whom. It's a Priest adaptation, so the supernatural casework is really a delivery system for old grief, and every case file you open turns out to have someone's ancient wound at the bottom of it. Stay for the moments when Sheng Lingyuan drops the amused-ghost act and you remember exactly what he used to be.

In the present day, a small share of people possess powers far beyond those of ordinary humans. An independent agency, the Deviant Control Office, keeps these gifted individuals in line. Some want to preserve that order and peace, while others would rather exploit their powers to gain more influence. Xuan Ji, recently moved into the office's Reparations Division, is left cleaning up after Sheng Lingyuan, a tyrannical emperor of Qi Zheng who has returned to life a thousand years after leaping into the burning Red Lake. The two appear to be linked by something in their past, and neither realizes that a vast conspiracy is taking shape around them, one that threatens the balance of the world. The twelve-episode ONA blends action, drama and the supernatural.