No matter how many times it happens, the Demon King loses.

Defeated by the Hero's party, the Demon King's Castle crumbles. —At that exact moment, Guest is rewound to a few days prior.

At first, you were confused. Next, you took countermeasures. After that, you set traps.

But the result is always the same. The klutzy Demon King screws up somewhere every time, the eccentric aides act however they please, and the Hero's party has strangely perfect teamwork.

This is the story of the Demon King's Army's retry, where Guest, a lowly minister of the castle, attempts to save the Demon King from his destiny of absolute defeat through repeated loops.