Ever since Uchiha Shizhi proposed that shocking theory—if someone could perfectly control two dōjutsu within themselves, successfully fuse them together, and then undergo a series of mysterious transformations, ultimately applying this new fused dōjutsu upon oneself—it might lead to the emergence of an incredibly powerful and unique ability, something akin to the legendary kekkei genkai.
This idea struck Shiyu Uchiha like lightning across a dark sky, instantly igniting his burning desire for power. He also believed that once this special kekkei genkai formed, it would perfectly resonate with the Mangekyo bloodline, awakening his potential and boosting his power to the level of Madara Uchiha and Hashirama Senju.
It could even transform his Mangekyo Sharingan into something resembling an Eternal Mangekyo Sharingan—greatly enhancing his dōkuriki while eliminating the drawbacks of the Mangekyo, such as irreversible chakra depletion and eventual blindness.
Therefore, from that point onward, Shiyu Uchiha threw himself entirely into deeply comprehending his dōjutsu abilities. It was important to note that his dōjutsu had not been obtained effortlessly; rather, it had gradually emerged through the application of [Mystic · Fire Release · Chakra Mode]. Precisely because of this, when he began studying these extraordinary powers, compared to others, he naturally possessed an incomparable advantage.
During the brutal Third Great Ninja War, Shiyu Uchiha fearlessly applied all his hard-earned insights directly onto the battlefield, achieving extraordinary results that made him even more convinced his path was absolutely correct.
So, after the war ended and time became available, he naturally started withdrawing periodically into seclusion, wholeheartedly researching how to perfectly unify the powers of the Mangekyo.
He unleashed the astonishing dōjutsu of both eyes, skillfully integrating everything he had learned from them to carefully adjust and refine the already formidable [Mystic · Fire Release · Chakra Mode], using this unique chakra mode to synchronize the two eye techniques together.
Every time he tried to wield both eyes' powers at once, the boost he gained was incredible—truly comparable to the legendary Sage Art Mode of the ninja world!
However, he ran into a series of challenges along the way: completely fusing the two required mastery over a wide variety of complex chakra natures and form transformations.
Among them, Yin Release accounted for the highest proportion, followed by Fire Release—all fields in which Shiyu Uchiha excelled. Although extremely difficult, with enough time, they were not insurmountable.
Moreover, fully mastering this power also required additional knowledge of the profound mysteries of Yang Release. Compared to Yin and Fire Releases, this was an area where Shiyu Uchiha was slightly weaker, though still quite capable.
The most crucial element, however, involved knowledge of Yin-Yang Release—a domain entirely unfamiliar to Shiyu Uchiha. Though it occupied only a small portion, it functioned as the final critical touch within this Secret Jutsu, like the final stroke that brought a dragon to life.
Transforming that flawed theory into reality was naturally a task so daunting it defied description.
Yet despite facing such immense challenges, Shiyu Uchiha never once showed even a hint of hesitation or retreat. On the contrary, his determination to surpass his limits and master this earth-shattering power only grew stronger. He grew more and more eager to taste the fruit he had carefully cultivated with his own intellect.
Especially during the Third Great Ninja War, Shiyu advanced rapidly and achieved great gains. Except for the profound Yin-Yang Release, he had full confidence in mastering the other three chakra natures.
In particular, his Yin Release and Fire Release techniques had already been seamlessly fused together. Therefore, when it came to wielding this aspect of power, Shiyu handled it with effortless mastery and ease.
Moreover, after witnessing the fierce battle involving the Third Raikage, Shiyu benefited greatly from the opponent's "selfless contribution," successfully fusing Yang Release with his already perfected Fire Release techniques. Using this as a foundation, he further refined his signature technique—Kujaku. From that point onward, his understanding of Yang Release also reached an entirely new level.
During the final battle against the Iwa-nin, when Shiyu encountered those two terrifying Tailed Beasts, he resolutely activated both of his Mangekyou Sharingan eyes, throwing himself wholeheartedly into that life-or-death confrontation.
Although this action left him severely drained—his physical toll was immense, and even his vision in both eyes suffered some damage—the high cost naturally brought equally significant rewards, which were indeed considerable. After this fierce battle, Shiyu was now fully prepared, awaiting only one final element to complete his transformation.
That final element was the Yin-Yang Release, which Shiyu currently lacked. If he wanted to derive Yin-Yang Release solely from his understanding of Yin and Yang Releases, it wouldn't happen any time soon—at least a decade would be needed.
Otherwise, he could only follow in the footsteps of The First, trying to "seize fate's favor"—harnessing the power of the Mangekyou Sharingan to artificially force his growth forward. However, since doing so inevitably came with great risks, Shiyu had formulated a plan within his heart but had yet to take action. He hesitated.
Previously immersed in peace and familial happiness, his inner self had nonetheless been stirred slightly. Subconsciously, he felt some resistance toward potential dangers, genuinely unwilling to risk everything on a reckless move.
However, when Minato Namikaze ascended to the position of Hokage, an ominous premonition quietly crept into his mind—in accordance with the original storyline, he sensed the Nine-Tails' Rampage was now inevitable.
After all, Obito Uchiha currently possessed both of his Mangekyou Sharingan eyes, increasing his threat level tenfold or more. With the addition of Susano'o, he had become extremely difficult to deal with. In a direct confrontation, Shiyu had full confidence in defeating him—but defeating was one thing, killing him was entirely impossible.
The moment thoughts of his beloved family possibly falling into danger surfaced, he could no longer remain passive.
After a fierce inner turmoil and careful consideration, his strong belief in protecting his family eventually overcame his fear of the unknown.
His long-dormant fighting spirit suddenly roared to life like raging flames. He understood that only by stepping forward himself could he possibly safeguard the precious warmth and peace before him.
Therefore, after making his decision, Shiyu Uchiha did not rush in recklessly. Instead, he calmly made thorough preparations, arranging everything in advance. Even if something happened to him, he had already left behind appropriate contingency plans.
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