Cheerful Mimiko has a very strange family for a little girl -- a Panda for her Papa, and his son, Panny, calls her Mom! When Panny follows Mimiko to school, he must pretend to be a teddy bear so Mimiko won't get into trouble, but everyone wants a cute Panda! Despite his efforts to behave, Panny causes trouble in the school kitchen, and now the whole school is after Panny! Then, Panny makes a new friend, Tiny, a baby tiger who's wandered off from the circus. Getting Tiny back to his mom becomes the first adventure, but after a hard rain, the whole town is flooded and Mimiko, Papa Panda and Panny must rescue all of the animals from the trapped circus train!