Mahou Shoujo Isuka
English title: Magical Girl Isuka
Japanese title: 魔法少女イスカ
Type: OVA
Episodes: 3
Source: Visual novel
Genres: Hentai
Studios: Studio 9 Maiami
Producers: Pixy
Duration: 27 min per ep
Rating: Rx - Hentai

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)