A little boy finds a penguin on his doorstep and attempts to return him to his home at the South Pole, but soon discovers that the penguin was not lost, but lonely and in search of a friend.
After safeguarding her heart in a bottle hung around her neck, a girl finds the bottle growing heavier and her interest in things around her becoming smaller.
Even though the penguin and the boy are close friends and do many things together, the penguin decides that he wants to fly and he wants to do it on his own.
When tree branches begin disappearing and paper airplanes are left in their place, the forest creatures carry out an investigation to find the culprit who has been stealing their homes.