A century after the Demon King Mordiggian was defeated, Mordiggian, the former Heavenly King and a demon necromancer, has settled into a quiet life as a secluded shut-in.

But human inquisitors keep getting in the way of her peaceful existence.

To deal with them, Mordiggian decides to resurrect the legendary Hero Radian and turn him into her ultimate bodyguard. She carefully restores his heart, circulation, immune system, cell function, and brain, fixing every flaw that would normally give away an undead body.

She succeeds a little too well.

Radian awakens as a living human, completely free from Mordiggian's control.

And when he sees the demon necromancer who brought him back, he mistakes her for a Saintess sent by the Goddess.

Before Mordiggian can explain, Radian destroys her undead guards and carries her away to safety, determined to protect the Saintess and hunt down the terrifying Lord of Death, Mordiggian.

Unfortunately for him, they're the same person.