The Demon Lord had conquered the lands beyond humanity's borders, and the kingdom of Odelgarde placed its final hope upon a hero's party.

Robyn, the Hero of the Bow, was the only one who returned alive.

With his right eye lost, Robyn carried their broken weapons back toward his homeland. Ashamed of his failure and haunted by the moment he failed to release his arrow, Robyn abandoned his title and disappeared.

Then he met a strange girl with short red hair.

However,
The moment Robyn looked into her eyes. every instinct he had honed through years of battle screamed the same warning.

A demon.

The demon is strange, powerful, and completely unlike the monsters Robyn has spent his life fighting. After saving him from certain death, she discovers his identity as the former Hero of the Bow and makes an absurd request.

"Please help me become the next Demon Lord."