First, this is not my dump, I'm just sharing the hard work of an anon from /hbg/. He was able to dump the EU assets of Root Letter (3.61) and restructured the cpks so they would work with the japanese eboot.

Now, and the main reason I'm posting this, is that the japanese version stops displaying text after 54 characters in a line, so unless there's a line break to make it move line down, text cuts off like pic sometimes. The text is stored in the PCSB01019\Media\StreamingAssets\GAME\script.cpk at script\text\data\XXXX.dbin as UTF-8 encoded text, null terminated for each line (meaning each line ends with a 00 byte) Line breaks are designated a 0A byte (in place of a space). Anon moved where the line breaks for this particular line were and tested, it works, but to get the game fully working, this will need doing for every line with more than 54 characters. This would take too long to do manually, so unless someone program something to do it, you'll have to deal with this issue.

The game is fully playable tho, O and X button prompts are reversed and the cut lines still show up in full in the log (press square). I hope some programmer read this and provide a tool to get this game fully working.