Yuusha-kei ni Shosu: Choubatsu Yuusha 9004-tai Keimu Kiroku (Novel)

From Yen On: Heroism is 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.