Majo no Geboku to Maou no Tsuno  

The Witch's Manservant and the Devil's Horn, 魔女の下僕と魔王のツノ

The series centers on a witchs manservant running about to procure a devil kings horn for a certain unnamed reason.(Source: ANN)

Majo no Geboku to Maou no Tsuno has been published digitally in English as The Witchs Servant and the Demon Lords Horns by Square Enix through Manga UP!