Contact Casio to request for a hard copy. Since this phone is already old, there could be a possibility that a hard copy of the manual isn't available anymore.
But here in the Cell Phones Etc. website, you can get one now. It a PDF copy of the user manual. It has the same content as the original. You can download it for free, then just print it if you prefer a hard copy. Go to the Casio Brigade G'zOne page to download now.