[Successfully defeat Obito Six Paths, Madara Six Paths, and Kaguya Otsutsuki! Challenge Mission completed!]
After Nagasawa returned to the real world, the system's prompt immediately appeared.
[Tobirama Senju fusion rate +10%]
"Finally," Nagasawa sighed heavily.
Tobirama's Challenge Mission was the hardest one he had faced.
Defeating three Six Paths-level opponents consecutively as the highest damage dealer was no easy feat.
Tobirama's Challenge Mission was the only one Nagasawa could not clear in a single attempt.
Although the process was challenging, the reward was worthwhile.
Nagasawa believed that the last 10% fusion rate of Tobirama template was crucial.
It was even more important than the 90% fusion rate that provided him a massive amount of Chakra, advanced Water Release knowledge, and knowledge of various Forbidden Techniques.
The Templates varied from one to another. For instance, Templates like Yoriichi Tsugikuni was basically useless for him before reaching 100% fusion rate. However, once it reached 100% fusion rate, it was as if he had a whole new different Template.
Tobirama template was kind of similar Yoriichi Tsugikuni template, but Tobirama template granted him more advantage in this world. Rather than the raw power it offered, Nagasawa valued Tobirama's capability in developing Forbidden Techniques.
As he possessed more knowledge than Tobirama, Nagasawa believed that he could do better than Tobirama if he had Tobirama's skill in developing Forbidden Techniques.
Yoriichi Tsugikuni's ability was restricted to some extent by the limitations of the world. Even if he were incredibly powerful, he couldn't single-handedly destroy planets in Naruto world. At most, he could only cut down Muzan into pieces.
But with the ability he got from Yoriichi template, Nagasawa became so much stronger as it allowed him to combine the power of three Universes. The example was his Radiant Sun Mode.
Having acquired Tobirama Senju's Forbidden Techniques knowledge, the template integration process reached 100%. the template has seamlessly integrated into Nagasawa's body, and the template panel was now empty.
As Nagasawa freely explored his imagination, he suddenly had clues about Forbidden Techniques he had problem with in the past. While it might not necessarily be the correct idea, he constantly got an inspiration to develop new techniques.
Throughout his journey, Nagasawa has been constantly experimenting with various techniques, combining elements from One Piece Universe into Naruto Universe, such as Six Powers, and some of them were his own idea like the Radiant Sun Mode and Supernova Mode.
Despite many of these whimsical ideas not coming to fruition, Nagasawa has successfully developed extraordinary techniques like Radiant Sun Mode and Supernova Mode, which involved harnessing the power of the sun, an unprecedented and fantastical achievement in Naruto Universe.
With the innate talent inherited from Tobirama Senju, Nagasawa's previously fanciful ideas have gained newfound inspiration. One such concept he envisioned is the development of a new type of high-powered sealing tag, as well as functional seals.
While the term "sealing tag" might be unfamiliar to some, mentioning one of its kinds should ring a bell – the Explosive Tag.
The Explosive Tag is the most commonly used sealing tag among ninjas. Once activated, it underwent a countdown before exploding, causing significant destruction comparable to Fire Release Techniques that Jonin used.
Explosive Tag allowed Shinobi who wasn't blessed with Fire Nature Types to experience the joy of using Fire Release Techniques. While those tags were potent for ordinary Shinobi, their effectiveness diminished during the fight between skilled Shinobi, unless they were caught off-guard. However, expecting them to break through defenses like Susanoo or injure someone of Raikage's caliber was simply unrealistic.
Initially, Nagasawa even planned to seal his golden flames into sealing tags to create a deluxe version of Explosive Tags. Unfortunately, the paper was incinerated by his intense flame, leaving him in a rather awkward situation.
Another interesting concept he thought about was the integration of medical ninjutsu into a seal. Imagine being able to achieve a near-instant full recovery in battle while there was no Medic-nin around! If he succeeded, this invention could have made Nagasawa wealthy, potentially the wealthiest figure in the entire world.
However, he faced another problem as he discovered that the sealing tag Yang Chakra, rendering his attempts futile. Despite this setback, the Tobirama Senju's template provided Nagasawa with fresh inspiration for both explosive and medical tags. He remained optimistic that with time, those ideas would eventually turn into successful inventions, although he wasn't sure when.
Although Tobirama Senju was a genius, research always involved a process, and Nagasawa knew that.
Despite being aware of the challenges, Nagasawa doesn't allocate the majority of his time to the development of new Tags. His primary focus remained on his Sage Mode development and the creation of new Breathing Method.
However, Nagasawa acknowledged that developing new Tags might increase property, so he would make sure to spare some time to make the idea came to fruition.
After successfully defeating three Six Paths-level opponents and saving a world, Nagasawa decided to treat himself. He used Flying Thunder God technique to swiftly acquire a variety of sweets, including red bean dumplings, a cream cake, three boxes of cookies, two boxes of ice cream, and two bottles of strawberry milk. To him, it seemed like a reasonable reward for his achievements.
"Isn't it bad to show up unannounced?"
"What's the big deal? You're his disciple. Besides, although Brother Nagasawa seems a bit strange at times, he is reliable."
Kabuto tried to protect Nagasawa's reputation to some extent.
Kabuto then opened the door and entered with Itachi.
Soon, they saw Nagasawa sitting there, stuffing sweets, and chugging strawberry milk like there was no tomorrow.
Itachi and Kabuto fell into silence upon seeing Nagasawa gulping down strawberry milk with crumbs on his lips.
For a moment, the room was filled only with the gulping sound.
"Perhaps I open the door poorly. Let's try again," Kabuto solemnly said.
Itachi nodded, and the two opened the door again, and indeed, things had changed.
Nagasawa put the milk down, finished off a red bean dumpling in two bites, and now the corner of his mouth was completely red.
"Since you've found out, there's no way around it. Actually, brother Nagasawa is suffering from a life-threatening condition that would result in death if his sugar-level is low. He hasn't eaten sweets for several days, so he's currently desperate to replenish his sugar-level," Kabuto explained seriously, attempting to provide a reasonable explanation for Nagasawa's eccentric behavior.
He had done his best, even pulling Itachi out for a moment to give Nagasawa time to clean up.
Itachi nodded, and for the sake of his teacher's reputation, he believed what Kabuto said.