Mia is a little girl afraid of many things like darkness. To overcome the fear, she imagines an invisible friend, Frida, only visible to her. Frida becomes her intimate friend. However, Mia gradually forgets Frida after moving to a new house. She encounters a new friend Nai, who is the invisible friend invented by the little boy Junio who lived in the house before. But Nai does not have the ability to be invisible. And Junio almost forgets him, so Nai is going to disappear. Mia decides to save Nai. Suddenly, Frida occurs to her and she embarks on a journey to find Frida. 
The play integrates animation with live performance in an ideal manner, turning imagination into a lovely cartoon character, to tell a lively story about imagination and growing up.