From wikipedia: In 1979, the same year the manga ended, Unico made his animated debut in Kuroi Kumo Shiroi Hane (Black Cloud, White Feather), an ecologically-themed pilot film (for a proposed TV anime series) which was soon released directly to video. Unico meets a young girl named Chiko who is ill because of the pollution from a nearby factory, and becomes determined to cure her by destroying the factory.
