Sealing the Soul

Twenty three years ago, the demon king was born. The Wizard tower found the demon king when it was only an infant, however even then they were unable to kill it thanks to it's enormous amount of magical power and settled on sealing it's soul away in a unknown and far away dimension. You, are that demon king, and your soul has been sealed faraway in modern day Earth, born and raised as a regular human on Earth. However when a unexpected accident happens and you die, your soul is quickly dragged back to your true body. (You may choose your gender and appearance.)