No matter how competent and loyal a ruler may be to his state, he still needs assistants, reliable, faithful, and professional ones. This is also true for the Demon Lord, who has four heavenly kings at his disposal. They are the most basic servants who govern in a world unknown to humans. They are entrusted with truly difficult tasks, three of which they have already skillfully handled. However, they still need to determine the fourth candidate. And such a candidate is chosen as an average office worker from Japan. Yuchimura Danusuke is shocked by the responsibility that has fallen on his shoulders, as he never considered such a fate for himself.
However, the guy is not entitled to refuse, so he takes on his duties, bitterly realizing that any of his ordinary days could be his last. He has a solid reason for such judgments, as he completely lacks magical abilities, which are essential in the fantasy realm. But he will still try to survive, relying on his limited experience, even if it is limited to an ordinary office.