Like all children, Hanni Hase also wishes for a friend to play with. But finding a good friend is not so easy. The fish lives in water. The squirrel scurries through the treetops. And the moon shines silently from the sky. Hanni keeps on searching until the little mouse comes along and invites him to play hide and seek and puddle-hopping. Well - if this is not the beginning of a wonderful friendship...