well of course, like any other shonen manga, theres battle at its heart. battles and techniques.
though these games make a habit out of taking just battle and throwing in just the tiniest snippets of story, which is, i guess, all right for those who know the story by heart. who don't have to see all these things over and over in this weird 3d visual. similar to the dbz games of the last decade. towards the end, they literally had just walls of text between fights. and once you'd played as every character once, seen all special attacks, all the transformations, the game was basically over, as the stories were nothing new, or it was dumb and annoying in those 'what would be if' kind of missions.
anyways, i also don't see this work as a 'real rpg' since then, its just read read read and hit 'A' for basically 99% of non boss battles. not better in my eyes
i guess, as far as i can see, most shonen manga end up best in form of tournament fighters. because at heart, you want to see those attacks and beat people. naruto often tried to mix it with rpg, with walking, talking, questing etc... and it always ends up boring and stale and with annoying platforming to the point where you just do it to unlock whatever finishing it unlocks.