Ryūshiki stood before Kaguya, ready to teach by example. "Watch closely as I demonstrate the 'Eighty Gods Vacuum Attack.' Don't just focus on the spectacle—use your Byakugan and pay attention to how my chakra moves inside me when I strike!"
Zzzt—
Kaguya activated her Byakugan, eyes sharpened and focused.
In an instant, Ryūshiki's entire aura shifted—like a hidden dragon surging from the depths.
BOOM—! He swept his palm forward, and from his hand erupted an endless barrage of air fists, each one crashing with the force of a tidal wave.
Even after he withdrew his hand, the storm of chakra fists kept pounding the air, continuing for a full twenty seconds before finally fading away.
"That was just a demonstration," Ryūshiki said calmly, dusting off his sleeve and clasping his hands behind his back. "I only used a fraction of my power so you could clearly see how the chakra flows."
He smiled, eyes twinkling. "Did you notice anything?"
Kaguya nodded thoughtfully. "When you struck, three areas lit up with active chakra—the lower abdomen, your eyes, and… the center of your palm."
"Exactly," Ryūshiki replied. "The chakra network starts at the 'Root Chakra' in the lower abdomen. Every time you use chakra, that point shows a reaction. The palm is the 'gate' for the Eighty Gods Vacuum Attack. That's how it works."
"But what I want you to focus on is the Byakugan."
"Our clan's taijutsu isn't just about observation—the Byakugan is the switch for our chakra system. When it's activated, our chakra flows at full speed. Only then can we use the most powerful taijutsu."
"That's why, even though many of our people have the Rinnegan, none of them can—or would ever dare—abandon the Byakugan."
Kaguya nodded, but a hint of confusion crossed her face.
Ryūshiki noticed. "If you have questions, ask."
Kaguya hesitated, then said, "You didn't actually activate your Byakugan just now…"
Ryūshiki paused, realizing his mistake. I got careless and skipped a step, he thought. That's on me—rookie teaching mistake.
He coughed lightly, putting on a straight face. "Oh? You noticed? Good, that means you were truly paying attention. Actually, there's a trick to it…"
Kaguya tilted her head. "Background operation?"
"Exactly. Watch closely."
Zzzt—
Ryūshiki's Rinnegan shimmered, but now, the distinctive veins of the Byakugan bulged at his temples.
Kaguya blinked in surprise, thinking, Was it like this earlier? Maybe I missed it…
She decided to let it go. "What's the point of running it in the background?"
Ryūshiki grinned, pleased she'd bought it. "Two reasons. First, it throws off your enemies and lowers their guard. Second, you can use the Byakugan's visual range to launch Rinnegan techniques, striking down foes from hundreds of miles away."
"Oh…" Kaguya nodded, half-understanding. She only had the Byakugan herself, so the concept felt distant.
She had no idea just how terrifying this 'background operation' was in real combat—or how few could master it.
In the entire clan, only the three Kings—and Ryūshiki—could pull it off.
Ryūshiki grew serious again. "I'll demonstrate the Eighty Gods Vacuum Attack a few more times. Watch how the chakra travels through my meridians. Copy it exactly, refine the details, and master it."
Kaguya's eyes burned with resolve. "Alright! I'll pay even closer attention this time!"
So began her relentless training. In Tsukuyomi's accelerated world, Kaguya went from clumsy imitation to growing mastery of the Eighty Gods Vacuum Attack.
At first, her chakra fists sputtered and scattered. But as her control improved, the technique became smoother and stronger.
After three months in Tsukuyomi, Kaguya finally nailed it.
Zzzt—her Byakugan flared, and with focused chakra flow, she unleashed a barrage of fists.
"Haah… haah… haah…"
When the storm subsided, she was panting, exhausted but determined. "I counted. That wasn't eighty fists—it was fifty-seven!"
Ryūshiki chuckled. "Eighty is just a name—it means 'a lot.' The actual number depends on the user."
Kaguya pressed, "If you went all out, how many could you produce?"
Ryūshiki scratched his cheek, pretending to think. "Uh… maybe three hundred?"
He lied, not wanting to crush her spirit—the real number was likely over three thousand.
Still, Kaguya looked deflated, feeling painfully weak by comparison.
Ryūshiki reassured her. "Don't compare yourself to me. Power takes time. It's smarter to measure yourself against your partner…"
At the mention of Isshiki, Kaguya's eyes lit up. "Right, Isshiki's right eye is strange. It's not Rinnegan or Byakugan…"
Ryūshiki's tone cooled. "Ah, that 'watermelon' eye. Technically, it's a kind of Byakugan."
Kaguya focused. "How?"
Ryūshiki revealed another secret. "Normally, the Byakugan evolves into the Tenseigan when pushed to its limits. But evolution isn't the only path—mutation can occur. Isshiki's eye is a result of Byakugan gene mutation. Unlike evolution, mutation is random—sometimes stronger, sometimes weaker. Isshiki got lucky."
"Our clan has a few other mutated Byakugan like that. The techniques they produce are interesting, but mostly clever tricks."
Kaguya asked, "What about the Rinnegan? Everyone has Byakugan, but why do only some have Rinnegan?"
Ryūshiki gave her a long, thoughtful look. "You're getting sharper. Since you asked, I'll tell you the truth about dōjutsu…"
The campfire flickered as Ryūshiki's gaze deepened.
"First, the Byakugan is the origin of all ocular powers."
"It can mutate—sometimes randomly, sometimes in ways that get passed down."
"In ancient times, there was an unfavorable mutation that weakened the Byakugan's insight. Unfortunately, Takamagahara was peaceful for so long that this mutation was inherited by some clan members, generation after generation. Eventually, it became completely separate—a new kind of eye."
"That eye… is the Sharingan."
"When war finally broke out, Sharingan's lack of perception and taijutsu left those wielders at a disadvantage. They were seen as defective, even though the Sharingan could evolve into the Mangekyō. But compared to the Tenseigan, it was considered inferior and ignored."
"For the sake of war, they were sent to the front lines as cannon fodder."
"Until, through the crucible of battle, one clan member's Sharingan underwent a true transformation."
"That was Ōtsutsuki Taido—the first in Takamagahara to awaken the Rinnegan."
~~~~❃❃~~~~~~~~❃❃~~~~
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