Majo no Geboku to Maou no TsunoThe Witch's Servant and The Demon Lords Horns; El sirviente de la Bruja y los cuernos del Rey Demonio; The Witch's Servant and the Demon Lord's Horns; 魔女の下僕と魔王のツノ; 魔女的仆人和魔王的角; 마녀의 하인과 마왕의 뿔

The witch Vivian is dying, and she asks her apprentice Betty to prepare the only medicine who can save her. But to get a hand on the ingredients it's not going to be a piece of cake... because one of them is the horn of the demon king Kinguburu, and defeating him can be a matter of life and death.