The Sealing

Twenty three years ago, the demon king was born. The Wizard tower found the demon king when it was only a child, however even then they were unable to kill it, 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 as a regular human. 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.)