A film about two mortal enemies - a little mouse Whizzy and Whitebelly the fox, who after an unfortunate accident, meet in animal heaven. They lose their natural instincts and become best friends. Their wish to stay together after they return to earth comes true, but they are reborn into opposite roles. Thanks to the power of friendship they can even overcome what seems to be impossible.

The film Even Mice Belong in Heaven is about hope, a quest for love and courage, and about overcoming prejudices and old pains. The story reveals that everything that seems to be at an end is the beginning of something else, and what appears to be invincible can be surmounted.