The Witch's Servant and the Demon Lord's Horns

Arsenio, a faithful attendant to a witch, is tasked with a difficult mission by his master - to retrieve a horn directly from the Demon Lord. However, Arsenio's assumptions are challenged when he sneaks inside the Demon Lord's fortress and discovers that the Lord is nothing more than a mascot. He also witnesses the Lord bothering a beautiful young woman. Will Arsenio succeed in his mission or will he face unexpected challenges?