Assumptions made: you have a legally obtained copy of the game and are using either a PSP with custom firmware (CFW) or a PSP emulator (PPSSPP). These instructions are high-level and avoid enabling piracy.
The PSP utilizes a specific folder hierarchy for game saves. For Ultimate Ninja Impact, the typical path is:
/PSP/SAVEDATA/ULUS10582DAT00 Assumptions made: you have a legally obtained copy
Always match the save region to your game ROM. Identify correct save folder