Several modding teams have released "Storm 2 Complete" mods for PPSSPP. The most famous versions include:
Where to look:
Warning: Avoid "auto-download" websites that promise the ISO. They are often filled with pop-up ads, malware, or fake EXE files. Never download a Setup.exe file—PPSSPP games come as .iso or .cso files. Naruto Shippuden Ultimate Ninja Storm 2 Ppsspp File
Some modders have ported Storm 2 textures/sounds into Ultimate Ninja Impact as a mod, but it's not the real Storm 2. Several modding teams have released "Storm 2 Complete"
Naruto Shippuden: Ultimate Ninja Storm 2 was never released for the PSP.
The PSP only had: Where to look:
The Ultimate Ninja Storm series (Storm 1, 2, 3, 4) was made for PS3, Xbox 360, PS4, PC, and Nintendo Switch — not PSP.