Bremen 4: Jigoku no Naka no Tenshi-tachi

An anime special produced for a 1981 charity event by NTV, it features four animal characters: a cat, a dog, a donkey, and a chicken. Inspired by the Brothers Grimm fairy tale, the story follows their encounter with an alien named Rondo, who is on a mission to promote peace. After they help Rondo, he gives them a device that transforms them into humans. As humans, they travel to a town and witness the chaos of war.