As I awaited the return of my twin brother, who had left our village as the Hero, a female knight — a member of the Hero's party — visited me one night, seemingly avoiding prying eyes.

She revealed that, unbelievably, my brother had abandoned his duties as the Hero and eloped with the Saint.

The entire Hero's party is now searching for the runaway Hero and Saint, but the disappearance of humanity's hope cannot be revealed to the public.

That's why she had come to ask me to act as the Hero's body double—