"Hero" is the worst punishment in the world.
 
For those convicted of heinous crimes, they are sentenced to become a “Hero" and forced to enter the mandatory military service in the war against the Demon Lords. These convicts are not even allowed to die—if killed, they will be resurrected to fight another day.
 
Hero Xylo Forbartz, former head of the Order of the Holy Knights, leads a penal unit of deplorables fighting on the front lines. It’s in these direst of circumstances that he meets Teoritta, one of the world’s the strongest weapons.
 
"When every last enemy has been defeated, you are to shower me with praise and pat my head."
 
In order to survive and to take revenge on those who wronged him, he makes a pact with the goddess and launches headfirst into a maelstrom of war and intrigue. 

(Source: KADOKAWA Anime)

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Heroism—a punishment for only the worst criminals. Those sentenced to the fate of a hero are forced to fight at the front lines against the demon king’s army—and if they die, all they can expect is to be revived and continue the battle. But when their leader, convicted of killing a goddess, meets another goddess himself, the contract they forge may be enough to change the world…
 
(Source: Yen Press)

Sinned heroes will save this world... 
 
Being sentenced to Heroship was the most severe punishment one could be given. Heroes would be sent to the frontline of a never-ending battle against the demon lords. Not even death could relieve them on their duty. 
 
There was no end to prison sentence. Even if they fought for a hundred years, they would still not be released. Only by killing every last demon lord would they be pardoned for their crimes. And...that was no more than a pipe dream. However, things might be different for XYRO, Penal Hero Unit 9004. He accidentally meets a goddess...and she asks him to be her knight!
 
(Source: KADOKAWA Global)