Upon being brought into this world, Leno switches places with a boy who has similar characteristics to his on Earth, taking his place without anyone noticing. Once on Earth, Leno will go through various human experiences, with many social, school and family dramas, but, as unicorn luck would have it, he won't face it all alone. Leno will have the help of his friend Flora, a clumsy but determined apprentice witch. Leno is inserted into the Silva family without much trouble, as ordinary humans are not able to see mystical beings as they really are. When they look at Leno, they see his human "doppelganger".

In the school environment, Leno will learn to deal with the most varied types of beings, from bullies (who will always be on his tail), to brainies (who are not that smart), and the posh girls, a kind of spoiled young ladies gang. Besides humans, the Unicorn will learn to deal with other mystical beings who have been on Earth much longer than he has. With Flora's help in the endeavor to return home, Leno will live the typical adventures and conflicts of a young human being, without losing his unicornian personality, in a sitcom filled with many frustrated magic attempts and humor. The episodes will focus on the daily life of the Unicorn Boy and the little witch between the environment of their homes, school (where they are in the sixth year) and the neighborhood where they live, "December Square".