"Using the Body Flicker Technique consumes a significant amount of chakra," Shimizu muttered as he gauged the remaining energy in his body. He finally understood why most shinobi refrained from using the technique constantly.
The basic Body Flicker Technique was effective but too crude; its chakra consumption was enormous. In combat, it would be more practical to use the chakra for an offensive ninjutsu instead.
Shimizu frowned slightly. In the original series, the Body Flicker variants that appeared were incredibly advanced.
There were techniques like Ōtsutsuki Kinshiki's Purple Lightning Flicker, Gaara's Sand Flicker, Konoha's Leaf Flicker used by Hayama Shirakumo, and Zabuza's Mist Flicker. Not to mention the infamous Shisui Uchiha, renowned for his mastery of the Body Flicker Technique.
At a young age, Shisui had created the Phantom Flicker, combining the Body Flicker Technique with Sharingan illusions to gain widespread fame.
If Shimizu wanted to keep up with future battles, enhancing his speed was crucial.
The standard Sharingan improved chakra and perceptive abilities but offered limited boosts to physical capabilities. Unlocking the Mangekyō Sharingan remained a distant goal.
As for the Rinnegan, it required the fusion of Indra's and Ashura's chakra to awaken the Six Paths' powers, making it almost unattainable within his current limitations.
Whether through the simulator or some shortcuts to obtain the Mangekyō or Rinnegan, all would take too long.
For now, the best way to bolster his survival was by mastering a more advanced Body Flicker Technique.
"I currently have fire and lightning attributes. Developing a new ninjutsu should ideally focus on these elements," Shimizu analyzed as he entered his room, jotting down ideas on paper.
The most feasible approach would be creating a Fire Flicker Technique.
Shisui's Phantom Flicker relied heavily on the Sharingan, which was beyond Shimizu's current capabilities.
The lightning attribute had limited use for him in developing new jutsu. Techniques like Ōtsutsuki Kinshiki's Purple Lightning Flicker were likely unique to the Ōtsutsuki clan. Similarly, the Raikage's Lightning Flicker required the Lightning Chakra Mode, a secret technique of the Hidden Cloud Village, which he had no access to.
The Uchiha clan, however, had a vast array of fire-style techniques. Shimizu could study the chakra flow patterns in these techniques to develop his own Fire Flicker Technique, greatly reducing the difficulty of the process.
He sketched out a diagram of the chakra pathways involved in most fire-style techniques, annotating his theories and frequently revising them as inspiration struck.
Creating a new jutsu wasn't something that could be accomplished overnight; it demanded extensive theoretical knowledge as a foundation.
Before he realized it, dawn broke. A white dove waddled over his drafts, snapping Shimizu out of his thoughts.
Surprised, he glanced at the window, only to find that an entire night had passed. His desk was cluttered with pages filled with densely packed notes.
He poured himself a cup of coffee to relieve the mental strain.
"It would be great to have the Multi Shadow Clone Jutsu," he mused with a wry smile.
However, that technique was still sealed away in the Scroll of Seals and far beyond his reach.
Even the standard Shadow Clone Jutsu was ranked as a B-class technique.
An hour later, Nohara Rin arrived at Shimizu's house.
"Here, use this."
Shimizu handed her a luxurious medical training kit and a medical knowledge manual.
He warmly encouraged her, "If there's anything you don't understand, feel free to ask me."
"Thank you so much, Shimizu," Rin said sincerely, bowing in gratitude.
"You're welcome."
Shimizu smiled. "Every gift in life comes with a price," he thought to himself, but he kept the thought unspoken.
The first step was to get her to trust him. The second was to deepen that trust.
Once he achieved that, the third step could begin...
Time passed swiftly. Days turned into months, and over a year went by.
Shimizu immersed himself in learning medical knowledge, diligently improving himself and quietly building his strength.
During this time, he performed numerous simulations but unfortunately didn't acquire any extraordinary bloodlines.
The three-year simulation period was simply too short. If only he could extend it to the time when Kaguya Ōtsutsuki revived...
By surviving countless Fourth Shinobi World War simulations, he could eventually steal Kaguya's powers.
Most of his simulator rewards consisted of tools like soldier pills, kunai, and explosive tags, along with practical household items.
However, the most valuable gains were the ninjutsu techniques and medical knowledge he obtained.
Shimizu stored everything meticulously in a sealing scroll for future use.
When the war ended, he could sell these items for a hefty profit.
One day, Shimizu went to Konoha Hospital as usual.
"Nonō-nee-san," he greeted, placing a basket of fruit on her desk.
Shimizu had purchased nearly every type of fruit in Konoha, delivering them daily to Yakushi Nonō.
"You're spoiling me, Shimizu. My house is already overflowing with fruit," Nonō remarked with a light chuckle, momentarily pausing her research notes.
"Nutrition is important," Shimizu replied, not looking up from the book he had just opened.
There was no harm in taking good care of her, especially when Nonō was such a reliable resource.
The room fell into silence, broken only by the rustling of pages and the faint scratching of Nonō's pen on paper.
Nonō glanced at Shimizu from the corner of her eye, her expression contemplative.
Shimizu's ability to learn amazed her.
It was one thing for the Uchiha to excel at ninjutsu. But why was he so adept at memorizing medical texts? Was his brain structure different?
Shimizu had devoured tomes like Histology and Embryology, Otorhinolaryngology and Head-Neck Surgery, Regional Anatomy, and Obstetrics—each the size of a fist—in mere days.
Even weeks later, he could recall every detail with perfect accuracy.
If she hadn't observed that Shimizu wasn't using chakra during his studies, she might have suspected he'd invented a memory-enhancing jutsu.
"I feel like I have nothing left to teach you," Nonō admitted suddenly.
Her words were genuine. Shimizu had already absorbed a vast amount of medical knowledge. What remained was for him to apply and expand upon it independently.
All knowledge, no matter how authoritative, was subject to challenge and revision.
Science advanced by overturning old paradigms. Many of the theories Nonō had once studied were now obsolete.
"I disagree. You've taught me so much, Nonō-nee-san," Shimizu replied with a warm smile as he opened another book.
Without Nonō, he wouldn't have access to these resources in the first place.
Knowledge in Konoha—and the ninja world at large—was heavily monopolized.
Ninja born to civilian families had limited opportunities to learn anything beyond the most basic techniques.
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