How Can You Have Such an Extravagant Idea?

Sometimes, things could not be said too plainly.

Shirou Emiya could not simply tell Tobirama Senju that as long as he was truly resurrected, he could cure his older brother.

Tobirama Senju was suspicious by nature. Once Shirou laid it all out, the man would surely suspect that his resurrection was part of a conspiracy.

Although it was indeed a conspiracy.

But precisely because it was a conspiracy, it had to be carefully nurtured and designed step by step. Otherwise, it would be easily seen through.

However.

Tobirama Senju was being rather unreasonable. He showed no concern whatsoever over whether Shirou Emiya could truly be resurrected, caring only about what this Yang Power was that could solve his brother's lifespan problem.

"Lord Shirou, what is Yang Power?"

Tobirama Senju furrowed his brow and began analyzing it on his own. "This power seems related to Yang Release Chakra. I remember that Yang Release Chakra can indeed create many miraculous secret techniques, and the use of Medical Ninjutsu is also related to Yang Release Chakra..."

For example, the Akimichi Clan within Konoha Village.

Tobirama Senju knew that members of the Akimichi Clan excelled at using the secret technique developed from Yang Release Chakra—the Multi-Size Technique—which could make the human body and its strength enormously larger for a short time.

"Correct."

"Yang Power is the ultimate form of Yang Release Chakra."

Shirou Emiya had no choice but to explain the concept of Yang Power, doing his best to tempt Tobirama Senju. "Yang Power can create life from nothing, regenerate a patient's severed limbs, and rapidly restore damaged organs..."

As Shirou Emiya spoke, his gaze turned regretfully toward Hashirama Senju on the sickbed. "Naturally, it can also grant life anew to patients whose vitality has been exhausted, allowing them to continue living..."

"Then..."

Tobirama Senju was curious and asked the crucial question. "How can a ninja bring their Yang Release Chakra to its ultimate level and gain Yang Power?"

"That is not easy."

A glint flashed in Shirou Emiya's eyes. He sighed softly. "The simplest method is for someone who possesses Yang Power within their body to share that Yang Power with another person..."

"Your brother."

"He is the most suitable person for me to share Yang Power with."

A trace of emerald-green Chakra appeared in Shirou Emiya's palm before slowly dissipating. He said regretfully, "Unfortunately, the Yang Power in my body vanished without a trace during this resurrection. I do not know what happened..."

"..."

Tobirama Senju took a deep breath.

"I'm sorry."

"This was my mistake."

Tobirama Senju took the initiative to apologize, explaining in a low voice, "There was an error in my Impure World Reincarnation technique, because this was my first time using this jutsu..."

"It is of no consequence."

Shirou Emiya did not blame Tobirama Senju. While comforting him, he continued digging the pit. "Perhaps it is because this body is not the one I had while alive. Perhaps it disappeared in the Underworld..."

"Mm..."

Tobirama Senju nodded, his brow tightly furrowed.

???

Shirou Emiya mentally gave Tobirama Senju a question mark.

Wait...

You really think this is my problem?

If you were not the one who messed up, could it possibly have been me, a senior from the Ancient Era, who had the problem?

To ensure the Impure World Reincarnation technique succeeded, I deliberately kept my soul in the Underworld. I even came willingly when the technique summoned my soul!

If I had not cooperated voluntarily...

It would have been a miracle if this crude technique had succeeded!

What a headache.

At this point.

Shirou Emiya could only make do and continue.

At the very least, he needed an excuse to remain in the present world first.

Even if he could only remain active in the Shinobi World with an Impure World Reincarnation Body, there would be other opportunities in the future. After all, it was not as though he had failed to leave behind contingencies back then.

"Forget it."

Shirou Emiya looked at Hashirama Senju on the sickbed and let out a long sigh. "For now, I will try some other medical methods. First, I will restrict the Chakra in his body and prevent his self-healing regenerative ability from splitting the cells in his body too quickly..."

"That will not be easy."

Tobirama Senju agreed with Shirou Emiya's approach, but he did not quite believe in Shirou Emiya's methods. "My brother's Chakra is very powerful. It will be difficult to restrict it..."

"It truly is powerful."

Shirou Emiya raised a finger, and a trace of black appeared at its tip. He praised, "It is no weaker than your clan's ancestor, Ashura..."

"This is..."

Tobirama Senju's expression turned grave.

"A Curse Mark."

Shirou Emiya looked at the Curse Mark energy on his fingertip and introduced it. "This is a Curse Mark condensed from Natural Energy. It can prevent a person from using the Chakra in their body. If they rashly use Chakra, it will restrict their movements..."

"I do not know whether it will work on him..."

Shirou Emiya looked cautious, seemingly uncertain whether his method would succeed. "There are traces of Sage Mode training within the patient's body. His body may adapt extremely easily to the Curse Mark's energy, and it may not be able to seal his power..."

"Natural Energy... may I sense it?"

Tobirama Senju looked at Shirou Emiya and made the suggestion himself. "I have some understanding of jutsu. Perhaps I can see whether it can be improved and offer some help..."

That could not have been better.

This Medical Ninja from the Ancient Era hesitated at just the right moment.

Because Tobirama Senju was also somewhat conflicted. He trusted Shirou Emiya enough that he felt rather embarrassed to doubt the Curse Mark energy on Shirou Emiya's finger.

Even though Tobirama Senju knew the other party surely bore no ill intent, when it came to his older brother, he was unwilling to trust anyone else. Only by personally handling everything could he be at ease.

"I am only a little concerned."

A hint of unease appeared on Shirou Emiya's face.

"What is the problem?"

Tobirama Senju raised a brow.

"This is not a commonly used medical technique."

Shirou Emiya was indeed somewhat dissatisfied. He sincerely voiced his concern. "Although a Curse Mark temporarily seals a person's Chakra, once the person who receives it fully masters the Curse Mark, they can also gain even more powerful Chakra by fusing with it..."

"I am somewhat worried..."

"About spreading the power of the Curse Mark to the world..."

"It may be used for conflict by future generations, just like Chakra..."

Shirou Emiya sighed quietly over his past. "When the Sage of Six Paths and the Ninja Sect spread Chakra back then, many people worried that Chakra would be used for conflict. Ashura and I believed that people would use Chakra as we did, to alleviate the suffering of others..."

"Looking at things now..."

"Our ideas truly were mistaken."

"Chakra was ultimately used by ninjas to fight one another."

"Lord Shirou."

"That was not your mistake."

Tobirama Senju understood Shirou Emiya's concern and comforted him. "The mistake in this world has never been power itself, but the greed in certain people's hearts that refuses to cease."

"Please rest assured."

"I will not leak the Curse Mark."

Tobirama Senju raised his hand and coldly looked at Shirou Emiya as he made his vow. "Furthermore, if I use the power of the Curse Mark for conflict, then after my death, may my soul find no peace in the Underworld!"

"There is no need... to go that far..."

The corner of Shirou Emiya's eye could not help twitching.

Wait...

Tobirama Senju...

Do you really have no awareness of this?

You are a jutsu user who developed Impure World Reincarnation, disturbing the peace of other people's souls, yet you think your own soul can rest in peace after death? How can your idea be so extravagant!

However...

Since Tobirama Senju had already made such a vicious oath...

Shirou Emiya could only go with the flow and place the Curse Mark on Tobirama Senju.

If Tobirama Senju discovered some problem in the future and wanted to release his Impure World Reincarnation, the Curse Mark would also serve as a means for Shirou Emiya to restrain his actions.