When Stella makes a new friend and doesn't need her imaginary friend, Arlo, anymore, can he find his own path? One night, Arlo comes for Stella. Soon, he becomes her very best friend and they do everything together, just the two of them. But when Stella meets Sid, the boy who moves in next door, everything changes. Poor Arlo feels forgotten. Perhaps Stella doesn’t need him any more. Maybe it’s time Arlo finds a friend of his own who will be with him always.