Unico awakes in a mysterious land and is befriended by a resourceful watch cat, Chloe, who feels protective of the young unicorn. When they find themselves near a small village in the forest, they take refuge with a kindly, but helpless, old woman. To take care of her, Chloe begs Unico to turn her into a human girl, but that act of kindness has unforeseen consequences: Unico's love has awakened Venus and her minion, Byron, who want to destroy them both!

"Based on the manga created by Osamu Tezuka."