There is no official "Naruto Shippuden Ultimate Ninja Storm 4 Mugen."
Because Mugen is a PC program (Windows executable), converting it to Android is complex. Developers use APK tools to wrap the Mugen engine into an Android package. This is where things get dangerous. naruto shippuden ultimate ninja storm 4 mugen apk link
M.U.G.E.N is a free 2D fighting game engine designed by Elecbyte. It is not a game itself, but a platform where fans create their own fighters. Think of it as a "Lego set" for fighting games. Over the last 20 years, fans have created thousands of custom characters (called "chars") and stages. There is no official "Naruto Shippuden Ultimate Ninja