Yuku is a young mouse who lives with her family in the cellar of a castle. Her grandmother passes on the family values by telling her timeless folk tales. Injured in a tussle with a cat, the old mouse is bedridden and the parents tell their children that she will have to leave them to follow the little blind mole into the Earth's tunnels. In one of her grandmother's storybooks, Yuku learns that the flower of the Himalayas can save her. She leaves on a journey of discovery to find the flower. She has to cross the rat quarters, go through the crow field to the enchanted forest, go over the little bridge of fear and meet the three giants. And finally, has to escape from the wolf!