Feng Zheng said, "How long can you balance a leaf on your head during Leaf Concentration Training?"

Daisuke replied, "23 minutes."

Tatsuya said, "28 minutes."

Fumimachi said, "17 minutes."

Bunjiro said, "38 minutes."

Ryoma said, "26 minutes."

Feng Zheng said, "That's too short. For now, stop practicing other Ninjutsu and increase your Leaf Concentration Training to one hour."

Tatsuya immediately complained, "But that training is so boring!"

Feng Zheng said, "Tatsuya, you have no choice."

Ryoma complained, "Can't you teach us some of your Ninjutsu?"

Feng Zheng looked at him and said sternly, "The reason I became strong is because my foundation is solid. If any of you can't even maintain one hour in Leaf Concentration Training, you should give up your dream of becoming a Ninja and just drop out."

Feng Zheng's response surprised them. Feng Zheng was their age. They thought he would be friendly and help them like a friend. They never expected Feng Zheng to be stricter than the school teachers.

Before anyone else could say something to annoy Feng Zheng, Daisuke said, "Alright, Feng Zheng. We'll do our best."

Feng Zheng said, "Come back when you can do that. Oh, by the way, come around noon normally. If I'm not home then, it means I'm on a mission. You can come back in a few days to check."

Daisuke nodded. The group left Feng Zheng's residence.

As soon as they came out, they immediately started complaining. Bunjiro said, "This is such a waste of time. I admired him so much before, but I didn't expect him to be so arrogant!"

Ryoma agreed, "Yes. He'll make us drop out if we can't do boring Leaf Concentration Training!"

Daisuke said, "Although we grew up together, our relationship hasn't been very close since we entered the academy. We should be grateful that he at least agreed to help us."

Fumimachi added, "I heard he could maintain the Leaf Concentration for over an hour in his second year at the academy, so his advice might be right."

Tatsuya sighed and said, "Anyway, we're struggling in school, so let's try his method. If it works, we can become Ninja; if not, it makes no difference."

They chatted for a while, then decided to follow his instructions.

Feng Zheng had anticipated their reaction when he spoke those harsh words. But he didn't care. He wasn't concerned about these five people; whether they graduated or not was unimportant to him. He just wanted to see how to properly guide future subordinates.

If future subordinates complained like them, he would either let them go or kill them, depending on the situation. He had no time to cultivate someone who was both lazy and untalented.

Feng Zheng quickly put the entire incident behind him and began to decide which Lightning Release Ninjutsu he should start practicing first.

He entered the lowest level of the basement, thinking, "My clones chose 11 Ninjutsu to learn. But 3 of them are very inconvenient to use in combat. However, these three seem to be preparatory Ninjutsu for the Raikage's Lightning Release Chakra Mode. It's not surprising that Konoha is probably trying to deduce some steps to learn it. But they haven't been able to deduce it completely. Although it's also possible they deduced it but didn't put it in the Library."

"The other 3 Ninjutsu are a series of Ninjutsu. The Rank D and Rank C variants will be abandoned later. There's also one Ninjutsu with potential but is very inaccurate."

"That leaves 1 auxiliary Ninjutsu, 1 defensive Ninjutsu, 1 long-range Ninjutsu, and 1 mid-range Ninjutsu, plus one Rank B Ninjutsu. Konoha's Lightning Release Ninjutsu reserves are truly disappointing. Another problem is that there is no Lightning Body Flicker Technique. So, I can't use this attribute for long-range escape. I still have to rely on the Body Flicker Technique."

"Anyway, I'll start with this series, then move on to the 3 preparatory Ninjutsu. Although they're not very useful on the battlefield, they might be able to further strengthen my body."

Feng Zheng made a Hand Seals gesture, straightened his right arm, and cast the Lightning Release Jutsu. A bolt of lightning formed in his palm and shot towards a metal statue, narrowly missing the target.

Feng Zheng analyzed, "Wow, I learned it on the first try! Now that I've learned so many Ninjutsu, learning new Ninjutsu will be easier. Especially if it's just a Rank D ninjutsu. Anyway, I still need to refine the aim of this Lightning Release Ninjutsu, then continue practicing the Lightning Burst Jutsu. This shouldn't take long."

Feng Zheng began to practice. A few hours later, he successfully increased the accuracy of this Ninjutsu to 100%.

The Lightning Release Jutsu did not cause much damage. At most, the opponent would only receive a slight electric shock. However, this could temporarily paralyze the opponent.

Feng Zheng then continued to learn the Lightning Burst Jutsu. This was a Rank C Ninjutsu.

Its effect was the same as the Lightning Release Jutsu. The only difference was that it was not a single bolt of lightning, but a continuous release of lightning at the target.

This Ninjutsu would continuously strike the opponent until the user decided to stop or didn't have enough Chakra to maintain it.

Feng Zheng learned and could accurately aim at the target within a day. However, he realized a key problem.

"Although I can aim accurately, I can't completely control the intensity of the electric shock. Only in about 15% of cases does its intensity reach the level I want."

Feng Zheng breathed a sigh of relief. "Fortunately, I didn't try those Ninjutsu before realizing this problem. That would have been a real hassle! Alas, I still underestimated this world. Learning Ninjutsu also has dangers! However, this problem shouldn't affect my learning of the Lightning Beam Jutsu. I'll train my control ability after learning this Ninjutsu."

The Lightning Beam Jutsu is a Rank B Ninjutsu. This Ninjutsu is merely an enhanced version of the Lightning Burst Jutsu.

It can emit a beam of lightning twice as wide as the Lightning Burst Jutsu. The electric shock from this Ninjutsu is extremely painful and highly lethal.

Even if one dodges this Ninjutsu, as long as they are within 60 centimeters of the beam, they will still be attacked.

Due to the immense power of this Ninjutsu, small lightning arcs occasionally shoot out from the lightning beam, which can hit anyone nearby and cause more damage than the Lightning Release Jutsu.

Three days after Feng Zheng began learning this Ninjutsu, he stood before a metal statue. He made a Hand Seals gesture and aimed his right palm at the statue. Lightning appeared in his palm, and a beam shot towards the statue.

The lightning beam struck the statue. The statue was continuously attacked by the beam for 30 seconds before it stopped.

The statue was severely damaged. Its face had melted and could no longer be called a face. Multiple cracks appeared on the surface of the statue.

Feng Zheng smiled and muttered to himself, "Alright, I've learned the single-target mid-range Ninjutsu. I should train my control ability now."

Feng Zheng returned to the room that had endured the electric shocks. He opened a scroll, took out some items, and set up an electrical circuit.

The circuit had an 80,000-ohm resistor and an ammeter connected by wires. Another pair of wires connected to the other end of the ammeter and resistor. These wires remained open-circuited.

Feng Zheng grabbed the wires with his right hand and began to generate electricity. Current flowed through the circuit, and the ammeter began to display readings.

Feng Zheng made up his mind. "2.3 amps of current. I'll try to maintain 1 amp for 10 minutes first. Then I'll try to maintain stability at other amperages. I should also check these two readings with a voltmeter instead of an ammeter. The resistance of the resistor won't drop like the human body, but it's better to check."

Feng Zheng began to practice. His control improved slightly, but not significantly. The lightning was very unstable.

Feng Zheng could easily provide maximum power continuously, but controlling it at a lower level was still difficult.

He continued to practice until he had to go on a mission. His team gathered outside the mission center.

Yuan Feibao went in and accepted a mission. He came out and said, "I've accepted a mission to the Land of Frost. It's said that a family heirloom was stolen, and they issued a Rank B mission to retrieve it. The opponents are rogue Ninja from Hidden Cloud Village. Feng Zheng, your Wind Release Ninjutsu will play a very important role against their Lightning Release."

Feng Zheng nodded. After making some preparations, the group left the village.

The group passed through the Land of Fire and the Land of Hot Water, then entered the Land of Frost.

The journey took a day and a half, and they finally reached their destination.