In Konoha, at the start, Hinata was given the Tenseigan.

Hinata, who was sitting at the same table, quickly stood up and put her index finger in front of her mouth.

"Shh~~ Natsuki-kun is meditating, reinforcing the seal of the Great Demon God, and working hard to protect the world."

Hinata's big eyes blinked, her face full of seriousness.

Upon hearing this, Iruka couldn't help but take a small step back.

A great demon? How terrifying!

I instinctively didn't dare to disturb them.

But in the blink of an eye, he realized that she was just sleeping.

And you gave me such an absurd reason. This is my class. Don't tell me that this world has never heard of any demon god. If a demon god really appeared, I would destroy him.

He reached out to shake Xia Mu awake.

"no!"

Hinata exclaimed in surprise, reaching out with her little paws to grab Iruka's arm, trying to stop him.

"Ok?"

Iruka glared at him with sharp eyes, as if he were a demon.

"Forehead……"

The little paws were so frightened that they hung in the air.

The "devil's hand" continued its descent, about to touch Xia Mushi.

Why is it so quiet? Has get out of class ended?

Xia Mu suddenly sat up straight, stretching out his arms, looking as if he had just woken up.

"So you still know you're in class?"

"Were you sleeping just now? Have you been too tired lately and are you too sleepy? Hmm?"

Iruka's face darkened, but he still managed a weak smile.

"Teacher Iruka." Upon seeing the person who arrived, Natsuki's expression turned serious, and his lazy demeanor vanished.

"No, this little bit of fatigue is nothing compared to Teacher Iruka."

"The Great Demon God almost broke the seal just now, trying to disrupt the teacher's class. The Ninja Academy and even the entire Hidden Leaf Village are in grave danger."

"Fortunately, through strong willpower and deep meditation, I reinforced the barrier and resealed him."

"Teacher, there's no need to praise me. This is what a student should do."

Xia Mu said solemnly.

"Hi! You've worked hard, Natsuki-kun!"

Hinata, standing next to her, also looked serious, clenching her two little fists.

Natsuki-kun isn't afraid of being lied to; he must have just gone through a tough battle in another dimension.

"..."

Seeing the two serious little ones, Iruka's lips twitched.

Could they be telling the truth?

Believe it or not.

"I……"

"Teacher! Actually, I've always paid close attention in your classes, and I've even done pre-class preparation. If you don't believe me, try testing me."

Natsuki stretched out his arm, spread his five fingers, and stopped Iruka from speaking again.

"Very well, since it was you who asked for it, then I'll take this opportunity to test you."

Iruka finally revealed a slightly pleased smile. "This is what you asked for yourself."

Let me see what you're really capable of, you sleeping soundly in class.

Question: There were 890 birds in the tree. 130 flew away. How many are left?

"Fifty."

Q: Seven years ago, the mother's age was six times that of the son. The son is 12 years old this year. How old is the mother this year?

"Mom is 37 years old this year!"

"Two ninjas are 300 meters apart and spot each other at the same time. They immediately start running towards each other. One ninja runs at a speed of 8 meters per second every 4.4 seconds, and the other runs at a speed of 7 meters per second. Question: How long will it take for the two ninjas to meet?"

"20 seconds later!"

"Correct answer!"

Iruka glanced at the answer key of the arithmetic exam, which was originally intended for the graduating class, with a look of utter shock.

"Wow!!!"

The classroom became lively once again.

The main problem is that the question and answer exchange happened too quickly.

Natsuki gave his answer without even having time to hesitate.

Even the top student, Sakura Haruno, was secretly discouraged, as she hadn't figured it out yet.

"Teacher, you've answered so much. I also have a question to test everyone."

Looking at the lively classroom, Xia Mu couldn't help but grin and posed a question:

"There are 10 birds perched on the tree. I throw out only one kunai at a time, and one kunai can hit two birds. I only have two kunai in my hand."

Q: How many birds can I shoot down in total?

--------------------------------------

P.S.: Happy New Year! Wishing everyone good health and a prosperous Year of the Ox! (Updates resume!)

073: Xiao Li: Please, both teachers, accept me as your apprentice!

"Four!"

"This question is very simple. One kunai can hit two birds, so two kunai would hit four birds, right?"

"Shouldn't we be asking why Natsuki-kun's kunai can kill two birds with one kunai?"

The students eagerly rushed to answer.

Even Iruka nodded: "Four."

"Wrong, only two were shot down, because the other eight were scared and flew away."

Xia Mu shook his head and gave his answer. His expression was one of deep regret, as if lamenting that no one could even answer such a simple question.

"..."

"What?! You can interpret it like that?"

Iruka's face darkened; he felt that Natsuki had somehow managed to steer the math lesson astray.

But after thinking about it, he realized it made sense and he couldn't refute it. However, if things continued like this, everyone would have to answer the questions in a different way, and there would be no way to have arithmetic classes in the future. So he had no choice but to bite the bullet and ask Xia Mu to give him another one.

"This problem doesn't count, just the count. Let's forget about reality and find another one."

"Okay, let's choose another one."

"There is 1 bird on the first tree, 2 birds on the second tree, 4 birds on the third tree, 8 birds on the fourth tree, and so on. Question: How many birds are on the 64th tree?"

Xia Mu posed another question.

The problem seemed simple, but Iruka quickly went through it in his mind and found that he couldn't solve it.

I quickly took out paper and pen to count them, and found that the number was getting bigger and bigger as I counted. Before long, there were more than 100 million birds on one tree.

"Can so many birds really stand on one tree?"

"Don't worry about whether that many can stand on the tree; even if they fall, the number will still be the same."

"Besides, you yourself said not to consider reality."

After replying, Xia Mu sat back down and squinted his eyes again.

The morning quickly ended with Iruka leading his classmates in counting, but he still couldn't figure it out in the end.

But Xia Mu could tell exactly how many birds were on which tree.

Finally, Iruka had to admit that Xia Mu's arithmetic skills far surpassed those of ordinary people, and that learning these basic arithmetic exercises was indeed a waste of his talent. From then on, during class time, he continued to "meditate," keeping his eyes open or closed.

The morning passed quickly, and it was lunchtime.

The trainees breathed a sigh of relief and ran home for dinner, panting.

Of course, many people also bring their own lunch boxes, which allows them to have more time for their lunch break.

Hinata was one of them. She took out two bento boxes and gently shook Natsuki awake.

"Natsuki-kun, lunch is ready! We have sashimi-yaki, omelet rice, and three-flavor meatballs."