One day, an old man rescued a crane that had been caught in a trap. Then, one night, a young woman named 'Tsuu' visited the old man's house, and they began living together. Tsuu wove very beautiful and magnificent cloth. However, she would never let anyone see her while she was weaving...

It tells the story of Rock, a puppy whose mother is killed by a tiger and a fox. To fulfill his revenge, will achieve together a large number of animals. An animated collaboration between Osamu Tezuka and Toei Animation.