Mice who have to leave their school and immigrate because of a wild cat who wants to eat them up. Eventually the mice defeat the cat and go back to their home.

When nature is destroyed and iron and cement grow from the earth instead of trees, the poor animal has no choice but to urbanize. Khatan and Khamar, the two young deer in the story, also sell their homeland, Dasht-e Naz, hoping for a better life, and buy a small apartment in Kelileh and Demneh town.