Sentenced to Be a Hero: The Prison Records of Penal Hero Unit 9004

Dorter Ruzlas and Silo Forberts are "punished heroes", criminals who have been branded with a holy mark and forced to fight the Demon Lord. Even if they die, they will be revived, and if they fail in their mission, they will be tortured to death. While on a mission to save the Holy Knight Army from the annihilation, Dorter stole a coffin containing a "Goddess", a human weapon and Silo is forced to make a contract with her to complete his mission...