That’s where fan translation projects entered the picture. Small groups of dedicated modders have, over time, worked to insert English text from the official PS3 release into the PSP ISO. These patches require users to own a legal copy of the Japanese game (which can still be found second-hand) and apply the patch for personal use. However, sharing pre-patched ISOs crosses the line into piracy.
Koei Tecmo released Warriors Orochi 3 Ultimate Definitive Edition on Steam. It is fully translated into English and packed with almost all previously released DLC. i warriors orochi 3 psp iso english patch free exclusive