Cell Activation Forbidden Technique

Hyuuga Nen sat on the floor of his room. He activated his Byakugan and raised his arm, staring intently at his biceps. The bulging veins around his temples showed how difficult he was finding it.

Hyuuga Nen's vision delved deeper and deeper into his body. As he did, he made constant adjustments. At last, he saw the muscle cells in his biceps.

Among the muscle cells on the surface of his biceps, a small group in the middle was stronger than the rest. This was the result of strengthening them with chakra.

His eyes began to feel dry. Hyuuga Nen deactivated his Byakugan and walked over to the mirror. Looking at his reflection, he saw that his eyes were bloodshot.

"Looks like observing the cells inside my body through the Byakugan puts a lot of strain on my eyes." Hyuuga Nen rubbed his eyes as he thought.

"But can other members of the Hyuga Clan also see the cells inside their bodies with the Byakugan? I don't think I've ever heard of that. If I'm the only one who can, what's the reason?"

"Is it because of my talent, the Seal of Resilience, or both?"

Hyuuga Nen sat down, closed his eyes, and flexed his arm, carefully feeling how his muscles changed during the movement.

"Just as I thought, the strength in my biceps has become unbalanced. This attempt failed." Hyuuga Nen sighed.

A year after obtaining the training method for the Gentle Fist, Hyuuga Nen had mastered the Eight Trigrams Sixty-Four Palms.

After gaining a basic grasp of the Gentle Fist, Hyuuga Nen had secretly sought out bandits to test it. He discovered that he could produce the effects of the Gentle Fist by using the Strong Fist style.

"Looks like Kuromaru was right. My Gentle Fist chakra is more unusual than that of ordinary members of the Hyuga Clan. But using the Gentle Fist style with the Strong Fist puts even more strain on my body."

Although the Gentle Fist was more precise and subtle than the Strong Fist, it couldn't match the Strong Fist in power, speed, or range. Hyuuga Nen still decided to make the Strong Fist his main style, but that placed even greater demands on the strength of his body and chakra network.

Of course, Hyuuga Nen could slow the rate at which his chakra burst out when using the Strong Fist. But if his chakra couldn't keep up with the speed of his punches, it would just be the Strong Fist.

Hyuuga Nen came up with a way to strengthen his body with chakra so that he could use the Strong Fist to his heart's content.

"My theoretical knowledge isn't enough to support this method of strengthening my body. To meet my requirements, I need more advanced knowledge of Medical Ninjutsu, as well as plenty of experimental subjects, equipment, and money. But right now, I have none of those."

"The human body has all kinds of cells. I'll need to test what chakra intensity is required to stimulate each type of cell, and how long the stimulation should last."

"The only person in the Shinobi World who could meet those requirements is probably Tsunade. Yakushi Kabuto and Shennong might be halfway there."

As he thought, Hyuuga Nen formed a Chakra Scalpel. He held it up before his eyes and murmured:

"Calling this a Chakra Scalpel is generous. It's more like a chakra cleaver."

Hyuuga Nen didn't have a training method for the Chakra Scalpel. He had figured it out himself, so there was no way it could be used for delicate surgery. But it should be good enough for cutting meat.

Hyuuga Nen carefully controlled the Chakra Scalpel and cut away the muscle tissue, including the strengthened cells.

"Ah, I cut off too much!" Hyuuga Nen grimaced in pain, then used the Mystical Palm Technique to heal the area.

"What I need is to strengthen my entire body permanently. If I work on each type of cell one by one, given my current resources, I'll only throw my body out of balance and ruin it."

"If I try to figure it out through Medical Ninjutsu, it could take a very long time. I wonder if Konoha has the information I need. Maybe I should steal a copy?" The thought crossed Hyuuga Nen's mind.

"No, that's too dangerous. If I get caught, I'm dead. Is there some way I can take a shortcut?"

Hyuuga Nen frowned and murmured softly.

His eyes wandered aimlessly around the room until they fell on Taro, who was asleep.

With each breath, Taro's belly rose and fell. Hyuuga Nen pressed his lips together and stared intently at Taro's belly, as if pondering something.

"I've got it! Maybe this method is worth a try." Hyuuga Nen took out some basic Medical Ninjutsu materials and began reading softly.

"The human body has eight systems: the respiratory, circulatory, digestive, musculoskeletal, nervous, and endocrine systems, among others. These eight systems regulate and connect with one another, working together to carry out all of the body's vital functions."

"I was wrong to focus solely on strengthening cells. The requirements are too demanding. Maybe I should try a different approach and start with the body's eight systems!"

"The respiratory system is the first system through which the body exchanges with the outside world. I should use chakra to simulate the respiratory system, mixing low-intensity chakra into the oxygen I inhale and letting the chakra take part in the system's function."

This way, over a long period of time, Hyuuga Nen could strengthen his body naturally. The body could also adjust dynamically, preventing it from becoming unbalanced.

The more Hyuuga Nen thought about it, the more excited he became. He tossed the scroll aside and began experimenting at once.

He activated his Byakugan and controlled his chakra, making it take part in the function of his respiratory system. Throughout the process, he used his Byakugan to observe his body.

Half an hour later, Hyuuga Nen stopped. "The idea should work, but this kind of training is still tiring. It's not realistic to keep it up for a long time. It would be great if I could train automatically."

"Maybe I can use a Sealing Technique to achieve my goal."

At that point, Hyuuga Nen thought of the Four Symbols Seal. This sealing technique could use the cycle of the four symbols to contain evil power.

"Maybe I can inscribe this seal on the main organs involved in the respiratory system, then circulate some of the extracted chakra through the system. That way, I could train automatically. I might even combine it with the Seal of Resilience for an even better result."

Although Hyuuga Nen thought of doing this, he didn't act on it. It was still dangerous, and he hadn't fully mastered the Seal of Resilience. So he set aside the idea of automatic training for now.

Over the next few days, Hyuuga Nen tested his idea again and found no problems.

"I can't see the effects yet. It might take years before my body is strengthened."

"I didn't expect to develop a forbidden technique already!" Hyuuga Nen was a little excited. He felt this forbidden technique could affect his entire life, so he took it seriously and decided to give it a name.

"Considering its difficulty, this forbidden technique is undoubtedly S-rank, even in my improved version."

Besides, this version could only be practiced by members of the Hyuga Clan. The technique required exceptionally precise chakra control, along with the ability to circulate chakra over a wide area inside the body. Only members of the Hyuga Clan could emit chakra through the tenketsu all over their bodies.

Even someone else with exceptional chakra control could only control chakra within the chakra network. They couldn't circulate it over a wide area inside the body.

If he focused solely on strengthening cells, Hyuuga Nen even doubted anyone could complete this forbidden technique.

"The purpose of developing this forbidden technique was to strengthen my cells, so its name has to include the word 'cell.'"

At that moment, Hyuuga Nen thought of Shennong and his Cell Activation Forbidden Technique. "In that case, I'll call this the Cell Activation Forbidden Technique."

"An S-rank technique: Cell Activation Forbidden Technique!" Hyuuga Nen stood up and said excitedly. He stretched, and the fatigue of the past few days vanished in his excitement.

"My vacation is almost over. It's time to report back to Teacher Yuichiro."

Hyuuga Nen said the words, but his expression made it clear that his mind was elsewhere.