Paradox of Distortion (Demon!LevixReader)

Long ago, a monstrous demon, created by the seven deadly sins, released chaos into the human world to obtain power. In an old village called Shiganshina, the king sent his men to eliminate the threat and save his people, but the demon could not be stopped. No blade could pierce nor destroy his existence. He was powerful and ruthless that he desired more than what he had. He believed that he was invincible, however, one man stood up against him and sealed him away from the world. For 1,000 years, the demon had been banished and peace had returned...... Or so they thought.