The reason Tsunade placed such great emphasis on Kujaku was mainly because she believed this secret technique was ideally suited for individuals like herself and members of the Uzumaki clan, who naturally possessed Yang Release abilities.
Moreover, Kujaku had an excellent underlying concept. By cultivating it, one could effectively compensate for personal shortcomings and enhance their overall strength. Although Tsunade's current mental state wasn't ideal, preventing her from carrying out ninja missions, she never abandoned her pursuit of training. This Yang Release secret jutsu opened her eyes to new possibilities, which was why she valued it so highly.
Early the next morning, sunlight streamed through the windows into the room. Tsunade, surprisingly awake and not indulging in her usual laziness, got up early and headed straight to the training hall, ready to start the day's work—leaving Shizune completely stunned.
When Shiyu Uchiha and his wife arrived at Tsunade's residence with several large barrels of fine sake, they found that she had not only summoned several members of the Uzumaki clan but had also specially invited Kushina Uzumaki to join them in an important task—to improve and refine Kujaku.
As soon as they met, Tsunade couldn't wait to open a barrel of wine. She tilted her head back and took a big gulp before flashing a satisfied smile. "Mmm, well done! Didn't think you two would come up with this!" In high spirits, Tsunade then joined everyone in beginning the refinement of the ninjutsu.
They all sat together while Shiyu Uchiha first explained the general outline and core principles of the secret technique. Since everyone present had a high-level understanding of Yang Release, grasping the details wasn't difficult—even young Shizune showed impressive comprehension in this area. Then came the discussions on how best to improve Kujaku to make its entry-level techniques simpler and more accessible according to their own needs and capabilities.
Under Tsunade's guidance, everyone actively voiced opinions and shared ideas. After a morning of intense discussion, they determined a clear direction and goal for improving Kujaku. Over the next few weeks, everyone poured their hearts into it, constantly trying and experimenting, hoping to find the most effective improvement method.
During this time, Shiyu Uchiha demonstrated extraordinary talent and dedication. His understanding of the subtle aspects of Yang Release significantly deepened, allowing him to better control and apply this power. Additionally, since Tsunade found Shiyu somewhat likable, she personally handed him a comprehensive manual on Yang Release basics to help strengthen his foundation further and pave the way for future Yin-Yang Release cultivation.
While refining Kujaku, Shiyu Uchiha discovered he could integrate the Five Nature Transformations of chakra into the technique. This idea thrilled him greatly, but due to limited theoretical knowledge at the time, he couldn't fully support this innovative concept yet. Still, he didn't abandon it. Instead, he carefully stored the idea deep inside himself, sensing its importance and deciding to continue exploring and practicing it in the future.
After months of effort, they finally completed the first stage of the improved Kujaku—including the [Beast], [Tail], and [Wing]—well ahead of schedule, largely thanks to Tsunade's tremendous contributions.
The newly improved Kujaku not only increased in power but also saw significant improvements in efficiency and chakra consumption.
Shiyu Uchiha re-mastered Kujaku and discovered that although its upper limit hadn't significantly increased, its chakra consumption had dropped by nearly half. More importantly, prolonged usage improved his physical constitution, enhancing his endurance in battle and allowing him to unleash greater power.
However, progress on improving the second stage "[Tsubasa]" (Wings) and "[Maru]" (Sphere) wasn't going smoothly. Despite working closely together, Shiyu Uchiha and Tsunade kept failing to achieve ideal results. During this process, Tsunade took on the role of researcher while Shiyu became the experimental subject since he was the only one among them who successfully mastered the "[Tsubasa]" segment of Kujaku.
After extensive research and analysis, Tsunade finally reached an important conclusion: Although still primarily Yang Release-based, this segment of Kujaku actually incorporated a trace of Yin Release elements to complete the transformation. That's why all their efforts led to suboptimal results.
Faced with this dilemma, Shiyu had a sudden idea—he would use his deep understanding of bloodline limits to attempt a breakthrough. He proposed the concept of Yin-Yang Release—uniting Yin Release and Yang Release into one—and tried to spark Tsunade's interest.
To his disappointment, however, Tsunade seemed to show no special reaction beyond surprise, nor did she mention anything related to such techniques. This implied that the Senju Clan likely hadn't left behind any related techniques or research materials.
Eventually, Tsunade and Shiyu made a pact—if either achieved significant progress, they would exchange ideas and discuss. Meanwhile, Tsunade gifted Shiyu another scroll containing records about Tailed Beast Ball research.
This document was clearly authored by the Second Hokage, making its value self-evident. Seeing this, Kushina Uzumaki happily requested her own copy too, stating it was for Minato Namikaze. Shiyu speculated that Minato might currently be developing the hand-sign-free ninjutsu technique—Rasengan.
He even suspected that Tsunade had made other discoveries in certain areas, but she didn't reveal anything. However, Shiyu wasn't someone who liked prying deeply—his current gains already met expectations, so he had no reason to keep digging further.
Next, Shiyu began monitoring Shimon Hiruko. Unfortunately, at this point, Hiruko hadn't started committing crimes yet. Moreover, considering his complex connections with the Sannin, Shiyu decided temporarily against causing trouble. Instead, he chose to visit Hiruko first and leave a good impression for future preparations. After all, regardless of whether it would eventually prove useful, being prepared beforehand was never wrong.
Time flew quickly, soon reaching Konoha Year 46. During this period, besides personal cultivation, Shiyu anticipated the impending Third Great Ninja War. At one clan meeting, he proposed an important suggestion.
He recommended selling large quantities of borderland clan properties to raise additional funds. Such action would not only provide more resources for the clan but also strengthen the Uchiha Clan's overall power.
In addition, he secretly persuaded several elders to invest these funds in purchasing wartime supplies, storing them with the ninken to ensure the clan would have sufficient resources during the war, giving himself an escape route and avoiding being held at someone's mercy at a crucial moment. To realize this plan, Shiyu Uchiha personally visited the mysterious Nekobaa among the ninken and discussed cooperation with her.
Although Shiyu Uchiha's proposal faced strong opposition, through the joint efforts of both Shiyu Uchiha and Shizhi Uchiha, they pushed it through forcefully. However, this approach inevitably left temporary hidden dangers for Shiyu Uchiha—for the time being.
Shiyu knew all too well the risks involved, but confident in his own strength, he didn't let it bother him much. Perhaps time was pressing, leaving him no choice but to focus on the current matter first.
When war finally broke out, those negative effects would come to light—only to serve as proof of his foresight and turn misfortune into triumph.
Of course, it was also a deliberate trap. If anyone tried to seize this opportunity to attack Shiyu Uchiha, that person would surely fall victim to his schemes and be crushed completely.
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