There is no "100% complete" fan translation patch that turns the entire game into English in the traditional sense, but the community has provided two main ways to experience it:
Here's an interesting report on the patch: soukaigi english patch
For fans of Square Enix’s PlayStation 1 library, (or Sōkaigi ) has long been a "lost" treasure. This 1998 action-RPG featured a stellar soundtrack by Hiroki Kikuta and ambitious 3D gameplay, but it never left Japan. There is no "100% complete" fan translation patch
For decades, the language barrier kept Western players away. Here is everything you need to know about the , the state of the translation, and how to play this cult classic today. ⚔️ What is Soukaigi? the state of the translation
[Release] Soukaigi English Translation Patch v1.0