大地在净化和情况多难害的两重冲击下，已经处在解体的边沿，为了生计，人们创作发明了一个与世隔中断的都会，叫做ECOBAN(这个名字由ecology和ban合并起来，意义是“扑灭生态”)，而这个都会完全靠大地的净化物苟延残喘。　　可是，只有少少的经由遴选的人材可以进进这个隔中断的都会，这些人成为城市中的特权阶层，至于更多的其他人，则无助地被…

Some time after the Mousekewitz's have settled in America, they find that they are still having problems with the threat of cats. That makes them eager to try another home out in the west, where they are promised that mice and cats live in peace. Unfortunately, the one making this claim is an oily con artist named Cat …