Since the original Naruto Senki (and its popular modded versions like UA, Muga, etc.) are fan-made games, they are not available on the official Apple App Store.
However, users seeking to play the game on iPhone typically look for modified versions or IPA files, often found in specialized communities rather than official app stores. Important Notes for iOS Players: naruto senki ios link
If you are looking for Naruto-themed games on your iPhone or iPad, these are officially supported: Naruto x Boruto: Ninja Voltage Since the original Naruto Senki (and its popular
Verdict A fun, fast-paced tribute for fans with some rough edges—expect ads, possible performance issues, and uncertainty around official licensing. etc.) are fan-made games