Moving the research equipment wasn't much to talk about. Although there were many large items like lathes, moving them consumed a lot of mental energy.
But with the support of the mental link, Ryuji thought it was nothing!
Soon, everything was moved.
Ryuji neatly arranged the various devices inside the Portable Space according to need and aesthetics before returning outside to switch bodies back with Aka.
After some thought, Ryuji said in the mental link, "Aka, there's no need to guard the home anymore. You can come to Konoha and stay with me from now on."
"Alright, I'll pack a few things and come."
"Okay!"
Ryuji nodded and stopped paying attention.
Aka was stronger than him; no need to worry.
He took out the other major ten-year check-in reward… The Book of Golden Fairies.
He didn't open it immediately, instead first reading the system description.
[The Book of Golden Fairies: A magic book that uses necromancy to manipulate and reincarnate souls into Golden Fairies.]
[Origin: 'Humans' were annihilated, trampled by extraordinary 'Beasts'.
Aside from a young man who awoke alone from centuries of slumber, only the 'Sacred Swords' and the fairy soldiers who wield them could defeat the 'Beasts' in place of 'humans'.
After battle, the 'Sacred Swords' could be used again by others, but the fairy soldiers who exhausted their power would perish.]
'Is this the grimoire for creating Happy Girls?' Ryuji muttered after seeing the highly suggestive introduction, then opened the cover.
— Necromancy Detailed Explanation.
— The Mystery of Golden Fairies.
— Thirty-six Thousand Problems in Building the Floating Archipelago.
— The Glory of the Star God's Guardianship.
The table of contents showed four volumes. Due to other matters later, Ryuji didn't examine the contents in detail, only skimmed roughly. It seemed to be about necromancy, Golden Fairy creation methods, Floating Island construction methods, and the Star God Guardian's doctrine.
'Seems like these are the handwritten notes of the Black Dragon.' Ryuji closed the book.
The Black Dragon was one of the three Guardian Gods of the Star God in that world. He collaborated with others to create the Floating Archipelago and the Golden Fairy race.
'This is an unexpected delight!'
Ryuji stored the book in the system space, then began thinking while washing up.
He had no intention of creating Golden Fairies.
There were three reasons.
The first was need.
The Golden Fairy race was created as weapons to replace humans in wielding Sacred Swords.
This world had no Sacred Swords requiring humans to use, humanity wasn't extinct, and there were no enemies only Sacred Swords could destroy.
Therefore, the Golden Fairy race was unnecessary.
The second reason was the Golden Fairies' flaw.
The Golden Fairy race used necromancy to manipulate prematurely deceased souls for reincarnation.
But this had a major flaw: past life memories would awaken over time. If past life memories awoke, the current personality would be overwritten and disappear, leading to complete death.
This was an unavoidable tragedy, only a matter of time.
Why do something destined to end in tragedy?
The third reason... was actually similar to the first, also related to need.
That is, the power of the Golden Fairy race didn't meet Ryuji's expectations.
Don't just look at Happy Girl being so awesome, cutting a floating continent with one sword. That was because she was a reincarnation of a Star God's soul fragment; ordinary Golden Fairies weren't that powerful.
The Naruto World didn't have such awesome materials for Ryuji to work with, so naturally, he couldn't create such awesome Golden Fairies.
Therefore, he basically wouldn't make these things.
However, the Floating Island construction methods might offer great help.
Ryuji's designed Mechanical City... Its flight capability was a device consuming massive energy every moment. Without Dragon Vein support, it was impossible to stay airborne continuously.
But Floating Islands remained in the sky, seemingly with minimal or no consumption.
If he could understand the principle, it would greatly enhance Mechanical City's functions.
'I'll study it carefully after returning." Ryuji hung the wrung towel, adjusted his clothes in the mirror, and went out.
…
"You're too slow, brat!"
At a barbecue shop near the hospital, Tsunade discontentedly put down her glass, slapping the table hard enough to make it jump.
Ryuji quickly steadied the tableware in front of him, looking speechless. "Didn't I invite you to a big meal to apologize?"
Moving research equipment, briefly skimming The Book of Golden Fairies... though he tried to speed up, he still delayed the 8 AM transaction to past 10 AM.
Tsunade glanced at the table nearly covered with grilled meat plates and even high-quality sake, her angry expression softening somewhat. "Hmm, at least you have some sincerity. I won't pursue this matter this time."
As she spoke, she took out a scroll and handed it over. "What you wanted is all inside."
Ryuji also took out the prepared scroll for exchange.
After both received each other's scrolls, they eagerly took out the materials to check.
Don't misunderstand.
Neither the Strength of a Hundred Seal research data nor the nerve-linking technology data could be fully recorded in a single scroll.
These were sealing scrolls; the materials were recorded on many A4 papers stored inside.
Both were experts; a brief glance confirmed authenticity, so they put away things and peacefully ate grilled meat.
Tsunade almost constantly drank, only occasionally picking up a slice or two of grilled meat to eat.
Ryuji silently ate grilled meat, not drinking.
Not that he didn't drink or want to, but he was underage; the owner wouldn't sell him alcohol, so he could only peacefully eat grilled meat.
Regarding this, Ryuji could only complain internally.
He became a Shinobi at eight, started missions and killing. He's now fifteen, already a Jonin, yet he was denied alcohol for not being of age?
Initially, they had little to say, but as Tsunade drank more, she became talkative, asking all sorts of unrestrained questions.
Like asking if he had a girlfriend.
Upon hearing 'no', she started mercilessly mocking him for still being a virgin.
Regarding this, Ryuji only smiled, treating it as drunken rambling.
"Your attitude is really annoying!" Tsunade put down her glass, her entire upper body leaning on the table, discontentedly grumbling. "So young, yet so deep, always trying to gain advantage in everything, just like an old man."
The 'old man' Tsunade referred to was Konoha's higher-ups.
Ryuji understood.
Regarding this, he still just smiled, making no comment.
However.
Looking at the woman leaning on the table, Ryuji frowned slightly.
He just saw Tsunade's body trembled slightly, as if... 'Sobbing?'
'Probably an illusion.'
Though Tsunade had vulnerable moments, overall she was a strong woman, unlikely to cry in front of a stranger.
But,
Considering her earlier words and the crystal necklace she traded, crying wasn't entirely hard to understand.
'It seems this transaction really cost her dearly.' Ryuji sighed inwardly.
That necklace held immense significance for Tsunade, its value far beyond its material worth.
That's why he was surprised when Tsunade took it out as a trade.
Because, in his view, Tsunade would never trade this item under any circumstances.