Naruto: Unlimited Kekkai Genkai

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Ishigami Hara didn't care what Tsunade was thinking. He had been bullied enough over the past few years, and today he got his payback with interest.

Who would have thought that Tsunade, who seemed so generous and casual, was actually inexperienced in certain things? For this, Ishigami Hara could only mourn for a second in his heart.

"I... I'm going back," Tsunade muttered.

She was still a woman after all, and especially in this situation, being stared at by Ishigami Hara made her feel guilty for some reason.

How old was Ishigami Hara? Just came of age.

How old was she? Almost forty.

The two were almost twenty years apart!

This age gap made Tsunade feel a sense of guilt, as if she had done something morally questionable.

"No, it's obvious that I'm the one who's at a disadvantage!" Tsunade thought, trying to convince herself to be angry again. She felt conflicted, but when she looked at Ishigami Hara's face, all her frustration melted away.

There was no denying it, his face was simply too captivating.

"How can a man be this beautiful? It's so infuriating!"

The more she looked at him, the guiltier she felt, her pretty face flushing red once again.

Ishigami Hara took a sip of tea, watching as Tsunade's expressions shifted—sometimes angry, sometimes blushing. She looked quite conflicted.

"Sigh..."

A sigh from Ishigami Hara interrupted Tsunade's thoughts.

"Don't think too much about it. Things have already come this far, so just be more generous. To be blunt, you're still the one who benefited here, and I reluctantly accepted you."

Hearing him say this again, Tsunade's anger flared.

"Damn it, you b*****d kid, it's obviously... you... you b*****d!"

Suddenly, Tsunade shifted uncomfortably, the unfamiliar sensation in her body catching her off guard.

Ishigami Hara, still calm, took out a sealed scroll from his robes, unsealed it on the table, and a burst of white smoke dispersed, revealing a smaller ninjutsu scroll.

"Take this," he said, offering it to her.

"What is this?" Tsunade asked, rolling her eyes at him as she took the scroll. As she opened it and examined its contents, her eyebrows shot up.

"What is this?"

Ishigami Hara nodded, his expression neutral. "As you can see, it's the Strength of a Hundred Seal. I made two improvements on the original technique, and this is the final product."

While speaking, Ishigami Hara raised two fingers.

The next moment, a lavender diamond-shaped mark appeared on his forehead, just above his eyebrows. With Ishigami Hara's striking face, it gave off an odd, almost sisterly feeling.

"It really is the Strength of a Hundred Seal," Tsunade murmured, noticing the same diamond-shaped pattern on her own forehead. While not surprised by the technique itself, she was curious about Ishigami Hara's improvements. Her attention shifted back to the scroll in her hand as she examined it closely.

The more she read, the more engrossed she became.

The predecessor of the Strength of a Hundred Seal was a Yin Seal: Release sealing technique of the Uzumaki clan.

After Uzumaki Mito's improvements, the original version of the Strength of a Hundred Seal was created, which could accumulate chakra and maintain the vitality of the practitioner. When necessary, it could release the seal to achieve a chakra burst, enhancing combat power.

Tsunade, building on Mito's work, retained those functions but modified it further, converting the chakra burst into vitality to obtain a stronger recovery ability, which became the basis for the Creation Rebirth.

Ishigami Hara, in turn, made two significant improvements, leading to the version of the Strength of a Hundred Seal that now appeared in the scroll.

As Tsunade read through the scroll, her eyes widened in disbelief. She glanced up at Ishigami Hara, then back at the scroll, astonished. "Are you kidding me about the effects of this?"

Ishigami Hara calmly set down his teacup, nodded slightly, and raised two fingers again.

"Strength of a Hundred Seal: Unlock!"

The next moment, Ishigami Hara's robe moved as if stirred by wind, and steam surged from his entire body. Then, his body began to shrink, his height reducing from over 1.8 meters to around 1.6 meters, and his face took on a more youthful appearance.

"The first effect: age reversal. The current limit is eight years."

Ishigami Hara lowered his hand, halting the shrinkage of his body. His face, now more childish than before, reflected a younger version of himself.

"I used the chakra released by the Strength of a Hundred Seal to act on body cells in a special way, reversing their age and restoring my youth. I've temporarily reversed two years. Right now, I'm in the physical state I was in at sixteen."

As he spoke, Ishigami Hara seemed dissatisfied with his current appearance. After making a few hand seals, a crackling sound echoed from his body, and he quickly returned to his previous form, including his face.

"In order to hide this technique's first effect from you, I spent two years of my life."

He then looked at Tsunade, who was completely stunned.

"Is this for real? Age reversal? How did you manage that? No, how did you bypass the natural law of cell growth? You know that human cells are generally replaced every few years, but your technique can reverse eight years. How do you reverse the process of cell replacement?"

Ishigami Hara raised his chin. "Look at the scroll again."

Tsunade huffed but obediently looked back down, her eyes widening in shock.

"Cell chakra? Hiss..."

At that moment, Tsunade was utterly astonished. As the strongest medical ninja in Konoha, she understood exactly what this technique represented.

"Did you... discover a way to immortality!?"

Cell chakra—didn't that imply immortality?

Ishigami Hara shook his head. "Not quite, at least not comprehensively. The inspiration comes from chakra creatures like the Tailed Beasts. I've only scratched the surface. You know the challenges of true immortality. For now, there's something still missing."

He set down his teacup, smirking. "But I have some ideas. If I keep at it, I should be able to achieve it, given enough time."

Tsunade opened her mouth as if to say something but eventually just shook her head.

"Why are you giving me this?" she asked, shifting the conversation.

Ishigami Hara looked at her, smiling. "As Nawaki's brother-in-law, I have to offer some sincerity. You are the heir of the Senju clan. You already have power and prestige, but beauty and youth are also essential. Consider this technique my betrothal gift."

"You—what do you mean? Are you serious? Our age difference..."

Tsunade began to protest, but Ishigami Hara raised his hand, cutting her off.

"It's decided. You won't suffer any loss. Keep reading. I think you'll be interested in the second function," he said.