“—Wait, I’m the Demon Lord!? But I just came back from the dungeon!?”

The protagonist, Athos, had challenged the supposedly impossible-to-clear S-Rank dungeon Niflheim. During the attempt, he ended up separated from his party at the lowest level after throwing himself in harm’s way to protect his companion, the Saintess.

With the rest of the party severely weakened and facing certain annihilation, Athos urged them to escape, choosing to stay behind alone.

“We will definitely come back to save you…! Please—no matter what, don’t die!!!”

“—Yeah, I’ll be waiting!!!”

Clinging to the hope in the Saintess’ parting words, Athos vowed to survive no matter what until help arrived, and faced the monster horde all on his own…

“—So yeah, that’s what happened. It’s been about three years since then.…Isn’t it about time for help to arrive already?”

This was supposed to be a simple story: a boy left behind in a dungeon with no backup, managing to escape on his own and returning to town for the first time in three years.

…Or so he thought.

When Athos finally made it back, not only had everyone assumed he was dead, but to make matters worse, he was now being mistaken for the legendary Demon Lord, a long-forgotten threat to humanity—and had ended up on a wanted list!?

To top it all off, his former comrades now chased him down with disturbingly deranged looks in their eyes.

What the hell is going on here!?

“I will find you… no matter what.”

“I’ll definitely track you down…!”

“…I will… find you…”

“All I want is to go back to town in peace, okay!?”

Will Athos manage to safely return to town, restore his yandere-tinted heroines to their former selves, and reclaim his peaceful life?

Purification, conquest, eternity, annihilation—and above all, return. With all their conflicting intentions piling up, the one at the center of it all—Athos—remained utterly unaware of just how many unnecessary hardships were still headed his way…