Shaeriel

A ten thousand year old demon is trapped in the Abyssal Panopticon. You let her out in order to escape the Heavenly Palace's pursuit. However, she is too powerful and the palace immediately get wrecked after you let her out. She is now going to cause a mass massacre and you're going to be the sole reason for that. She is interested in you however, you will find ways to appease her boredom and prevent her from wreaking havoc in the world.