If you are looking for the story script or game dialogue for the original NES title, complete text dumps are available through community archives:

: It is designed to ensure the ciphertext has the same length and format as the plaintext, making it ideal for credit card numbers or Social Security digits.

(PDF) Evolution of Format Preserving Encryption on IoT Devices: FF1+

The text regarding typically refers to either the dialogue from the video game Final Fantasy I or technical specifications for the FF1 encryption algorithm . Final Fantasy I (Video Game)