While it uses the "Musou" (beat-'em-up) engine of Impact , the mod adds updated HD textures, redesigned menus, and character movesets inspired by the Storm series.
Modders often add new ultimate jutsus and character skins (such as Naruto’s Kurama Link Mode) not found in the original PSP games.
You likely downloaded a renamed file (e.g., a zip or an .exe virus) or a PSP-compatible game incorrectly labeled. Scan it for malware immediately. The true Storm 3 is over 6GB; PSP ISOs max out at ~1.8GB.
These PPSSPP files typically include high-definition (HD) textures and updated UI elements to mimic the Storm 3 aesthetic.