Al and Louisa Delvecchio relocate from Milwaukee to Chicago to open a family restaurant. They bring along their son, Chachi, and his girlfriend, Joanie, comes to stay with them over the summer, but eventually decides to move there because of school. Chachi's band plays at Al and Louisa's restaurant, and the series follows the ups and downs of Joanie and Chachi's relationship in this spin off of the popular sitcom, Happy Days.

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