The Devil's Dark Knight

When Uchiha Sasuke was hit by a technique created by the Rabbit Goddess, he had not been expecting to land in a world as plain as paper. However, a chance meeting with a fallen-angel changes everything as Rias realizes she may have bitten off more than what she could chew in her newest recruit. "You are sorely mistaken, I do NOT take orders from anyone, be it a Devil or a God."