I, Hatake Yinghuo, transmigrated into Kakashi's younger brother and even bound to a [Firepower Deficiency Anxiety System].
System: Ninjutsu? Rasengan? That stuff is too weak. It isn't impressive enough!
For the Clone Technique graduation exam, the System thought the technique was too lame and immediately rewarded me with [Ninjutsu: Desert Eagle]!
I blew the target apart with one shot and told the examiner it was a "bullet clone."
Iruka-sensei froze on the spot, and Mizuki started looking at me strangely!
When I faced the rogue ninja Mizuki, I hefted an RPG: "There's no problem that one RPG round can't solve!"
After one blast, the rogue ninja was gone, and Iruka and Naruto were both stunned.
From then on, the Shinobi World had a new pacifist carrying a rocket launcher.
Kakashi, with a headache: My foolish little brother, you call that ninjutsu?!
Yinghuo, carrying an RPG: Bro, times have changed! My ninja way is: caliber is justice, and range is truth!
Classic AI novel, Kakashi is a grown-up male protagonist who's still just a little kid.