Sentenced to Be a Hero, Vol. 1 (manga)

Natsumi Inoue Rocket Shokai 

CONDEMNED TO A FATE WORSE THAN DEATH…Heroism―a punishment reserved for only the vilest criminals in human history. These so-called heroes are enlisted to fight on the front lines in humanity’s war against the Demon Blight. And if a hero dies, their only reward is to be resurrected and forced to continue their never-ending struggle. Such is the fate of Xylo Forbartz, former captain of the Order of Holy Knights and convicted goddess killer. But when Xylo comes face-toface with a new goddess, the pact they forge might just be enough to change the world…