Rengoku directly pulled down the menu, skipped past the others, and found Tsunade's name.
He took a closer look and saw that all four stars on Tsunade's bond were already filled.
After all, Rengoku had revived her lover and helped her get revenge. For someone like Tsunade, who clearly distinguishes between love and hate, her bond with Rengoku naturally needed no explanation.
Rengoku directly claimed the first three bond stars.
["Ding~ Tsunade's level one, two, and three bonds have been unlocked."]
["Congratulations, host, you have obtained: memory fragments, 10% chakra, secret technique Yin Seal."]
A large amount of Yang-attribute chakra appeared inside Rengoku's body.
But very quickly, the Yang attribute attached to that chakra completely transformed into Yin and Fire attributes.
'Looks like only the chakra Karin gives me won't be converted.'
Rengoku shook his head. When it came to changes in chakra nature, water, earth, wind, and lightning were all relatively easy to train, but Yang attribute required more planning.
Ordinary people all had Yang attribute in their bodies, but a purity like Senju Hashirama's was extremely rare across the entire ninja world.
Only the Uzumaki clan and the Senju clan possessed it.
But with Karin around, Rengoku wasn't in a hurry.
Within Tsunade's memory fragments were some of her insights on training the Strong Fist style and some experience in medical ninjutsu.
However, the memory fragments weren't systematic and were somewhat scattered, so Rengoku felt they were better than nothing.
But drawing Tsunade's Yin Seal technique left Rengoku a little disappointed.
After all, what he had hoped to draw was the Strength of a Hundred Technique.
But after carefully thinking about the Yin Seal, he realized that this technique was far more useful than getting the Strength of a Hundred Technique.
And, Rengoku quickly picked up the scroll of the Strength of a Hundred Technique and skimmed through it.
He finally confirmed it.
Tsunade's Strength of a Hundred Technique was a trinity-type secret art.
The Yin Seal opened up an acupoint at the center of the forehead, used to store chakra, which could be released explosively when needed.
The Strength of a Hundred Technique also had a prerequisite ninjutsu, which was Creation Rebirth.
Creation Rebirth could accelerate cell division to restore the body.
The Strength of a Hundred Technique formed a seal mark on the body, allowing continuous use of Creation Rebirth.
Among these, learning Creation Rebirth wasn't actually that difficult.
Rengoku had a very strong foundation in sealing techniques, so learning the Strength of a Hundred Seal wasn't difficult either.
The most difficult part, instead, was the Yin Seal, since it involved opening a point on the brain.
The brain, being the most delicate part of the human body, could easily lead to becoming an idiot, a vegetative state, or brain death with even the slightest mistake.
Even with Rengoku's pupil technique clones, it would take a large amount of time.
Now it was equivalent to having the hardest part done in advance.
"Sigh! Having a lucky encounter really is nice."
Rengoku couldn't help but feel pleased. Taking a shortcut like this gave him a certain sense of cheating.
'I can train the improved Sage Technique together with the Strength of a Hundred Seal.'
Rengoku thought this to himself.
After all, when he asked Tsunade for the Strength of a Hundred Technique, his original plan was to switch Sage chakra at any time to supply energy.
Now that he had learned the Yin Seal ahead of time, he could directly pour Sage chakra into the seal on his forehead.
Clatter!
The sound of the door being pulled came from outside.
Rengoku waved his hand, and his pupil technique clones turned into shadows and merged back into his own shadow.
"Shishou!"
Before she even arrived, a sweet voice came first.
Karin hurried over in quick steps, came to the table, and hugged Rengoku's arm, acting spoiled, "Did you miss me?"
Karin had gone to the barrier team after dinner to help deal with issues at the barrier nodes.
Now that it was already nighttime, she had been busy for several hours.
"Of course I missed you."
Rengoku gently patted Karin's hair, "Go take a bath."
"Hehe! Got it, Shishou!"
Karin took a nightdress from the wardrobe by the bed and went to bathe.
Rengoku stretched lazily, found his own sleepwear, and went to the other bathroom.
He lived together with Ryuri and Kaori so the house had two bathrooms.
Now that Karin had moved in, it was quite convenient.
In this world, the level of everyday technology was about the same as in Rengoku's previous life.
So there were things like water heaters and showers.
While standing under the stream of hot water, he shifted his consciousness to the Uchiha training ground.
At the Uchiha training ground, there were a full fifty shadow clones of Rengoku.
With such a big commotion, it was impossible for the clan members not to notice.
By now, quite a few clan members already knew that Rengoku had returned.
But for a ninja, the most important thing was, of course, information secrecy.
Although these clan members were very excited, none of them went around spreading the news of Rengoku's return.
Right now, the training ground was filled with thick white mist, making it impossible to see anyone clearly.
Because what Rengoku's clones were currently practicing was the Water Release: Hidden Mist Technique.
After all, using other techniques and spitting out a few small water arrows would look somewhat ridiculous.
If they produced white mist instead, at least it looked decent, especially since so many clan members were secretly watching to see what their clan leader was training.
Now the timing was about right. The fifty shadow clones had already trained for an entire day.
Continuing would affect the main body's mental state the next day.
So under Rengoku's mental control, the shadow clones began turning into smoke one by one and disappearing.
A large amount of the day's training experience and memories started transferring back to Rengoku's main body.
Rengoku worked to adapt to the mental impact. After some effort, he got through the brief period where his brain felt stalled.
After finishing his bath and changing into sleepwear, he went back to the bedroom.
Rengoku lay down on the bed, a bit tired. The training speed of fifty shadow clones was fast, but the exhaustion was still real.
He half-closed his eyes to rest. Not long after, he heard light footsteps.
Rengoku quickly caught a familiar scent, and then a pair of hands pressed onto the acupoints on the top of his head.
"Haa!"
As Karin massaged him, Rengoku let out a breath.
Karin wasn't particularly interested in medical ninjutsu. She had only learned this recently after seeing how hard Rengoku had been training.
Although her technique wasn't perfect, it still eased some of his strain.
"Shishou, feeling better?", Karin's voice sounded by his ear.
Rengoku responded, then opened his eyes.
Karin still had a faint flush on her body from the bath. Even though she was wearing a nightdress, it couldn't hide her well-curved figure.
Seeing Rengoku looking at her, Karin smugly leaned forward slightly, "accidentally" revealing a large expanse of fair skin.
"Heh!"
Rengoku pulled Karin onto himself in one motion.
Karin giggled as she lay on top of him, the soft touch passing through the thin nightwear to Rengoku.
She spoke in a teasing tone, "Shishou… what do you want to do?"
Rengoku looked her over without restraint for a few moments, then reached out and flicked her forehead.
"Stop messing around. Time to sleep, my fiancee."
He emphasized the word "fiancee," meaning they had an agreement.
Karin didn't actually dare to go too far. Most of the time, she just liked seeing the way her master was attracted to her, not that she truly wanted to be "eaten."
Of course, if Rengoku really lost control, Karin wouldn't refuse either.
She pulled the blanket over and obediently nestled into Rengoku's arms, leaving half her head exposed as she looked at him.
Rengoku kissed her forehead, "Go to sleep."
"Mmm…"
The warm and cozy feeling made Karin quickly grow sleepy.
She yawned and asked, "Shishou, Sasuke has already recovered. He came to ask if you'll do special training with him tomorrow."
Rengoku wrapped an arm around Karin and adjusted their sleeping position.
"We'll talk about it tomorrow. You still need to go call Yakumo over and have her test Sasuke's soul strength."
"Got it… Shishou… zzzZZZ!"
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