Guilty God

The entirety of Atalanta was once devastated by a plague launched against mankind, which nearly wiped out humans by distorting their souls. It was also believed to be the punishment of those who violated the laws of the universe. As a result, the ones who were directly affected by this phenomenon were cursed with strange powers, thus labelled as Sinners of the system. The curse was not something that could be undone. It was an endless cycle of inheriting the greatest sins of your past self and manifesting corrupted mana. Despite the curse granting them power, it was a double-edged sword, because the more Sinners use their powers, the more it corrodes their mind. For this matter, the people of Atalanta needed to crown a "God" who would fulfill the duty of eradicating evil. Therefore, the Atonement was established. It the method of choosing the next god, a tournament in which Sinners are pitted against one another and the one who emerges as the victor, regardless of their age, gender, race or social status, can indiscriminately challenge the current god to gain absolute authority over Sinners. The story follows Amity Aristiea of the nobility, the first and only noble who manifested the curse. After being exiled at the age of five, his banishment was finally lifted when he turned fifteen -- because he was ordered to participate in the Atonement. The only problem was that the ill-fated prince didn't have any interest in playing god.