The story takes place in a group of mice that were used by the National Center for Intelligence Research (NIMH) to conduct experiments such as intellectual development. The experiment went well and the mice had a human-like IQ, so they planned to escape, but a brave mouse died in the process. But this is not the story of this film, but the story of how the wife of the heroic mouse defended her child against danger. The little mouse at home was seriously ill, and the mother mouse tried to cure her child. On the way, she ran into a kind crow and was almost eaten by a bad cat. Finally, after an adventure, she succeeded in bringing the medicine home, but is her adventure over? Is it true that her child was saved?