Power-hara Genkai Yuusha, Maou-gun Kara Koutaigu de Scout Sareru: Yuusha Ranking 1-i Nano ni Tedori ga Gomi Sugite Seikatsu Dekimasen

In a world where countless heroes and demon kings exist, Allen is the one who holds the title of being the strongest hero. However, there are several problems that this caused for him: always being ordered to subdue the incessant number of demon kings, power harassment from the king, and being given rewards that don't even come close to compensating him for the amount of effort required. He's at the end his rope! But it's then that one of the demon kings reaches out a helping hand to the impoverished hero?! When the demon king's scout is sent out, and treats Allen extremely friendly while offering great pay, what will Allen choose? Source: Shogakukan