Rei Kaguya returned to the lunar battlefield much earlier than Kaguya Otsutsuki expected.
And when she saw the pair of azure Tenseigan in his eyes, utterly different from his previous Byakugan in both appearance and ocular power, even Kaguya Otsutsuki could not help showing a trace of surprise and solemnity.
Like the Rinnegan, the Tenseigan was one of the apex evolutions of Otsutsuki dojutsu.
Every independently evolved Tenseigan and Rinnegan possessed its own unique dojutsu. And because the Tenseigan and Rinnegan were higher in level than the Mangekyo Sharingan, the unique dojutsu they granted likewise far surpassed the level the Mangekyo Sharingan could reach.
Before obtaining the Tenseigan, Rei Kaguya had merely been a brat in Kaguya Otsutsuki's eyes, one who had only just gained a little growth and overestimated himself enough to oppose his parent.
But now, Rei Kaguya, who possessed the Tenseigan, was undoubtedly a "filial descendant" comparable to those two rebellious sons, Hagoromo and Hamura, and capable of posing a genuine threat to her.
Under such circumstances, choosing to continue fighting without retreating even a single step would be rather disrespectful toward the psychological trauma those two deeply filial sons, Hagoromo Otsutsuki and Hamura Otsutsuki, had left Kaguya Otsutsuki.
And so, Kaguya Otsutsuki decisively opened the unique space-time Kekkei Mora of the Otsutsuki clan—Yomotsu Hirasaka.
She attempted to leave this empty prison that was falling at high speed and return to the shinobi world, where countless living beings who had obtained chakra were multiplying and thriving.
She intended to reclaim the chakra that her rebellious son, the Sage of Six Paths, had scattered away, then return and deal with Rei Kaguya, who had inherited the rebellious will of both Hagoromo and Hamura.
But just as the black portal opened by Yomotsu Hirasaka appeared, Rei Kaguya, who had returned to the battlefield, narrowed his eyes.
The ocular power of his mysterious azure Tenseigan, like burning stars, surged greatly as he activated the first dojutsu he had obtained without hesitation.
"Voidless."
Special azure chakra spread and seeped through the moon's space like a drop of ink falling into still water.
With the activation of Voidless, both the black portal opened by Yomotsu Hirasaka and Obito Uchiha's Kamui dimension were forcefully sealed shut.
"What—"
Before Obito Uchiha could react at all, he was ejected from the Kamui dimension and instantly impaled through the body by the two bone clones that had been pursuing him.
With his face full of shock and disbelief, he was sealed by the bone clones without the slightest ability to resist.
Kaguya Otsutsuki, meanwhile, looked unexpectedly toward Rei Kaguya, who was panting faintly because he had forcefully sealed such a vast space.
With astonishment in her tone, she asked,
"Spatial sealing? Is this your dojutsu, Rei?"
"Cough. No choice. I am a taijutsu-specialized shinobi, after all."
Rei Kaguya slowly closed his left eye. While easing the consumption of his senjutsu chakra and ocular power, he raised the Ame-no-Murakumo Sword in his hand toward Kaguya Otsutsuki.
"If I do not seal space, I cannot make all of you obediently stay behind and fight me."
Voidless.
That was the Tenseigan dojutsu the system had awakened for Rei Kaguya after he deliberately selected the characteristic of "space."
It could sense disturbances in nearby space and, based on that, completely seal the space within a certain range, causing all types of space-time ninjutsu to become completely ineffective.
The duration and range of the spatial seal depended on how much chakra he consumed when activating the dojutsu. Once the spatial seal was activated, it possessed the same absolute establishment as Amenotejikara.
It was a dojutsu with very obvious strengths and weaknesses.
Its advantage was that enemies skilled in space-time ninjutsu would have nowhere to escape.
Its weakness was that it provided no direct enhancement to his own combat strength. When fighting an enemy stronger than himself, its effect was practically close to zero.
But for Rei Kaguya, drawing a dojutsu that guaranteed he could catch up to and touch the enemy was already an enormous enhancement.
Refusing to believe it, Kaguya Otsutsuki activated Yomotsu Hirasaka again.
But this time, she could not even tear open the black spatial portal.
"Stop making meaningless struggles, Ancestor Kaguya. This spatial seal will absolutely not be lifted before my chakra is completely exhausted. Other than defeating and devouring me, you will no longer have a second way to leave."
Rei Kaguya slowly raised the Ame-no-Murakumo Sword in his hand, pointing it directly at Kaguya Otsutsuki, whose expression had gained a shade of gloom and panic.
In a low voice, he said,
"Come. For the sake of completely ending this war that began thousands of years ago and has continued until today, let us kill each other, Kaguya Otsutsuki… The victor may freely enjoy and rule over the sweet fruit that is the shinobi world. The loser will become part of the other. A fair duel, is it not?"
"Become… part of the other?"
Kaguya Otsutsuki frowned, her brows so pale they were almost impossible to see. Because of Rei Kaguya's words, she could not help falling into a brief daze.
If she won, then she would naturally reclaim all the chakra scattered throughout the shinobi world.
For an existence like Rei Kaguya, who had grown by himself to a level nearly comparable to those two rebellious sons, Hagoromo and Hamura, while also harboring malice toward her, she had no reason to let him continue existing.
But what if she lost?
If she lost, how did Rei Kaguya intend to turn her into part of himself?
Would he directly seize all her chakra?
Or… did he know that secret, the one she had not even told Hamura and Hagoromo, the secret that allowed the Otsutsuki clan to truly become undying and indestructible?
And it was this instant of blankness that caused Kaguya Otsutsuki to pay an incomparably heavy price for her lack of combat experience.
Sizzle—
A fair arm, balanced in bone and flesh as though carved from the finest cold jade, shot into the sky along with blood that rapidly turned into ashes and scattered in the air.
And when Kaguya Otsutsuki's body instinctively launched a counterattack because of this sudden assault, Rei Kaguya's leisurely mockery finally drifted slowly into her ears.
"Dazing off in front of an evenly matched opponent is not a good habit, Kaguya Otsutsuki."
Rabbit Hair Needle!
Almost instinctively, Kaguya Otsutsuki activated the Kekkei Mora that could force Rei Kaguya, who had closed in on her, to retreat.
Her white hair, like a torrential downpour, carried enough force to pierce directly through the human body as it howled toward Rei Kaguya, whose movements had once again been captured by her Byakugan.
Rei Kaguya unhurriedly retreated some distance, swinging the Ame-no-Murakumo Sword in his hand and cutting apart every white needle that attacked him.
Then he suddenly stepped through the air.
With a storm exploding as his announcement, he once again pursued Kaguya Otsutsuki, who was trying to flee by ordinary means.
"Wrong! Wrong, wrong, wrong! That sword is not only forged from All-Killing Ash Bones! There is something else! Something else!"
Kaguya Otsutsuki gritted her teeth while regenerating the arm Rei Kaguya had cut off in a single strike.
At the same time, she frantically sensed the other power on the wound, a power completely different from All-Killing Ash Bones.
It was a type of energy that seemed capable of fusing with chakra, yet also appeared incomparably violent.
In Kaguya Otsutsuki's senses, even without All-Killing Ash Bones, that special energy could still cause tangible damage to her body.
How was this possible!?
All ninjutsu in the shinobi world needed chakra to activate.
As the Jinchuriki of the Divine Tree, the source of all chakra, in theory, she should not suffer any damage from ninjutsu powered by chakra.
Even Hagoromo and Hamura, who had sealed her back then, had relied on the power of chakra and taijutsu to battle her!
During the thousands of years she had been sealed, what exactly had happened to the shinobi world, which she had once viewed as a pasture she could freely rule and harvest?