Kazuya Soma, a real estate marketing planner, dies after being crushed by endless overtime.

When he opens his eyes, a woman claiming to be a god tells him the truth: he worked himself to death—and now, he’s been summoned to another world as a Hero.

His destination is the Continent of Calavir, a land already conquered by the Demon King. Humanity has fallen into despair, and the world awaits its savior.

The ultimate fate of a corporate slave after death:
A Hero in another world.
His mission: Defeat the Demon King.

…Or at least, that’s how it was supposed to go.“My Lord Demon King. I, Soma the Hero, pledge to work for you like a slave for the rest of my life!”

Can the so-called Strongest Hero really restore peace to the world—by serving the Demon King instead?