Ueno Kei knocked Naruto on the forehead again and said, "That's what you get for being naughty! There are still classes at the Ninja Academy today, right? You skipped class again, didn't you, brat?"
Ueno Kei's tone was slightly stern. After all, to him, Uzumaki Naruto was like a little brother, and skipping class was something he still wouldn't allow.
"Hmph, Big Brother Kei, you became a ninja before you even graduated too, didn't you? You're already a chunin now, right? Hmph, with my current strength, aside from that deadpan guy, there aren't many people in school who can beat me. I can graduate too!" Uzumaki Naruto said with a defiant look on his face.
Three years ago, after Ueno Kei graduated early and became a ninja, he did not tell Naruto that he had joined the Anbu. Not only was that Konoha's rule—Anbu members were not allowed to reveal their identities privately—but also because Naruto was still so young, and with his careless personality, it definitely wouldn't work.
He had only vaguely said that he had become a ninja early and could carry out missions. Simple-minded Naruto did not think too much about why Ueno Kei could graduate early. He just looked extremely envious and praised him, saying he was worthy of being his big brother, a genius.
That amused Ueno Kei, but at the same time, he could not help letting out a sigh of relief. It was really nice that Naruto was an idiot.
Even so, whenever Ueno Kei had free time, he would guide Naruto in his training. That made Naruto's actual combat ability unmatched among his peers except for that Uchiha orphan. His overall strength was basically around the top ten in the class.
But what gave Ueno Kei no end of headaches was that