I Will Develop a Ninjutsu, Why Are You so Worried?

I traveled through time and became Naruto. Bound with ninjutsu development system From then on, Naruto embarked on a path different from others: developing ninjutsu! Orochimaru: When it comes to forbidden arts, I'm not as good as Naruto! Tsunade: Is this medical ninjutsu? This... This is definitely a forbidden technique! Jiraiya: Naruto, do that forbidden technique '...' You just did again! Nine Lamas: Naruto, I beg you, how about you let me pay the rent..." Immediately afterwards—— The Nine Lamas begged: Naruto... Stop, my body is about to be hollowed out, are you sure this is an ordinary forbidden technique? I can't afford the rent on this special property. … Countless years later, the Ninja War is about to begin! Naruto rubbed a forbidden technique with his hands and everyone knelt down! This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.