English Patch for JP Client, Available on Both Linux and Windows
Disclaimer, this counts as modding so use it at your own discretion

Download the launcher below
https://github.com/Special-Operation-Decagrammaton/BA-TL-Launcher/releases
Instructions
- First, make sure the game is in the latest version, then download the launcer
- Unlock the file if it's locked by default by your computer
- Set the game folder first to where you installed "YostarGames\BlueArchive_JP\"
- Choose one of the branch, "main" for global english patch only and "translation" for translation up to VExC3
- Click Update Asset
- Launch the game
Alternative route if you don't want to use launcher
- Check github below, choose between global or translation patch according to what you need
- Download both resource.assets and excel.db
- Go to: BlueArchive_JP\BlueArchive_Data\StreamingAssets\TableBundles
- Find the large file (around 174 mb) whose name starts with *6993339912994747134_*
- Rename excel.db to the current/latest TableBundles version hash and replace the file
For example 6993339912994747134_544388113 → 6993339912994747134_3011745964 - Replace the resouce.assets inside BlueArchive_JP\BlueArchive_Data
- Open the game via run.bat, which should be available inside BlueArchive_JP folder (It's needed to run the game with anti-cheat system)
TL2TJP
What is this?
An experimental mod for Blue Archive that attempts to DE-localize certain lines
that have been sabotaged, whether intentionally or by purpose; using references found from fans and other reputable translators in the community.
If you dislike localizations, you can use below made by community. Note that this is for Global only as for now
Download link
https://drive.google.com/file/d/13YGgFY-8kpNvDg-jrz2ValfLF_nTkQRS/
Folder link
https://drive.google.com/drive/folders/1f1sYp1wEglPkXkQqpp6wppci0IWxqZod
Github
Latest Release branch (Global):
https://github.com/Special-Operation-Decagrammaton/BA-TL-Assets/releases/tag/latest-build
Translation Release branch: (Currently contains translated VExC3)
https://github.com/Special-Operation-Decagrammaton/BA-TL-Assets/releases/tag/translation-build
Launcher
https://github.com/Special-Operation-Decagrammaton/BA-TL-Launcher
This is the raw JP text repository, a collection of raw text for use in the BA-TL-TEXT project to compare both global and jp.
https://github.com/Special-Operation-Decagrammaton/BA-RAW-TEXT