Shrunk to the size of mice, the Straw Hats reluctantly join a family of mice bound to America for a better life. But when Luffy and the youngest son, fall overboard and presumed lost, the duo set off a chain of events that would change America (for mice anyway).

When Khyler leaves town for new ideas for next year's Halloween. Warren T. Cat returns and takes over Green River and nearly puts the lives of all of Khyler's friends in danger. Can the sheriff save the day, rescue his pals, what plans do Warren T Cat have? And what is he up to?