Mahou Shoujo Isuka

Based on the erotic game by Black Lilith.<br> <br> The evil stone conceives a part of the king of the hell's power in a different world. To prevent his revival, the stone is implanted into a body of a magical girl!<br> Now the clans from the hell follow after her.<br> The evil stone cannot be regained by a simple destruction of the body. Thus, they start disgracing the magical girl in various ways!<br> <br> (Source: DLsite English)