Modest Medusa follows the misadventures of a gorgon child called Medusa from the magical kingdom of Yeld. She arrives in the human world one fine Christmas Eve. Jake discovers her hiding in the closet of his house. After discovering that she cannot return home, Jake and his niece Marah treat her as their daughter.
For Jake it’s one unlucky situation after the next, but he always does his best to be a morraly just parent to the Medusa, holding off the craziest of demands while ensuring that she feels safe and loved. However, the fun doesn’t end there. Soon a host of monsters arrive to try and return Medusa home.