Based on the erotic game by Black Lilith. 
 
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! 
Now the clans from the hell follow after her. 
The evil stone cannot be regained by a simple destruction of the body. Thus, they start disgracing the magical girl in various ways! 
 
(Source: DLsite English)

Based on erotic game Mahou Shoujo Isuka by Black Lilith.

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