Unico the Unicorn possesses the remarkable ability to bring happiness to anyone he encounters. It remains unknown whether this stems from his personality or the powers of his horn. However, the gods grow jealous of Unico, believing that only deities should have the authority to determine whether people are happy or not. Consequently, Unico is banished to the Hill of Oblivion, and the West Wind is commanded to escort him there. Unable to bear inflicting such a fate upon an innocent being like Unico, the West Wind initiates his adventures by transporting him from one place and time to another, embarking on an endless journey to evade the gods' wrath. During this adventure, Unico meets Beezel, a devil child, and Katy (Chao), a cat who aspires to become a witch. Can he befriend them?