After the battle at the Shinobi Bridge, Team 7 didn't leave immediately and joined Team Gai with their mission.
Having a rotation on who will guard the bridge builders, it took a few weeks to finish.
During those times, Osamu didn't bother training his team and had them enjoy the days when they were not on duty.
This was because he does have a plan for them to train once they returned to the village.
Osamu gathered the two teams a few distance from the bridge.
"So why are we gathering here again instead of going back to the village as soon as possible, Osamu-sensei?" Naruto asked.
"If you're want to travel for 3 days on foot then I very much welcome you to go."
"But if you want to be back at the village in just a few minutes then I implore you to wait. But you, Naruto, I need you sit right here." Osamu answered as he draw seals on the ground and gestured to where Naruto needs to sit down.
As soon as he was done, he had them stand on specific spot within the seal he drawn.
It was almost identical to lord 2nd's formula for the Haraishim but this one is bigger and has more intricate seals drawn.
Some symbols were intertwined with each other and surrounds the space where the group were except for Osamu and Naruto.
So the latter asked.
"Uh, Sensei? Why are we on a different spot than the others?"
"That is because you're the battery and I'm the remote control."
"The what?"
"Well, let's just say that among us today here, you have the most chakra out of all of us combined."
"That is considering the fact that Gai is focused in Taijutsu and I'm just a new Jonin."
"While I can use my chakra for this, it will leave me pretty exhausted. That's why we're gonna use your chakra instead."
"I don't get the rest but beat that Sasuke-teme! I have the largest chakra, even more than yours." Naruto boasted.
"I've known that since the Academy dope. I'm not even surprise it took you this long to know."
"Teme~"
"Alright stop the ruckus and concentrate."
"What do I do Sensei?"
"Just sit there and put your hands on those two circles." Naruto nodded and did as told.
As soon as he did, Osamu performed the neccesarry hand seals in front of everyone.
Dragon-Snake-Tiger-Rat-Ox-Dragon-Horse-Dog-Boar-Bird-Tiger-Dragon-Rat-Ram-Hare-Ox-Dragon-Boar-Snake-Rat-Dog-Dragon-Bird-Tiger-Ram-Snake-Dragon!
'What focus! Even I would have a hard time performing 10 hand signs' thought Gai as he saw Osamu's performance.
Even his students were shocked and simply watch in daze at how smoothly Osamu shifts from one seal to the next.
"So this, this is what it means to be a Jonin? No, this is simply the tip of the Ice berg. Osamu-sensei never got serious in our training."
"I wonder how long would it take him to take out all 3 of us if he ever fought us seriously." Sasuke was in deep thought while Naruto and Hinata simply watched in fascination.
Once Osamu did all 27 neccesarry hands signs, he slapped both hands on the ground.
"Hiraishin level 4: Mass Teleportation Technique!"
And then everything around them suddenly changed in a blur and was replaced by a rocky terrain.
"Where are we? Wait this place feels familiar." Naruto started.
"Why don't you look at your left?" Osamu suggested.
Everyone's faces immediately turned to the suggestion.
What they saw was the whole of Konoha.
They were back!
"Amazing!" Lee exclaimed excitedly.
The rest said almost the same words in fascination and complemented Osamu.
"Now now, why don't you kids return to your homes and rest?"
"Team 7, you have 2 days off. I expect you to be at the training ground 3 after your rest. We will begin your next stage of training."
"Yes, Sensei." 3x
Gai also instructed his students to rest as he and Osamu will go and report the mission to the Hokage.
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Hokage Tower
After the report.
"So, what's your plan with that blade." Hiruzen asked.
"I would like to exchange this for a jutsu, GG."
"And what Jutsu are you going to request this time?"
"The Rasengan of the 4th Hokage." Hiruzen was surprised to the name of the jutsu and coughed with the pipe he was inhaling.
"Although I can feel a massive headache coming, I am no longer surprise with you. But I want to know why and how did you know about the Jutsu?"
"Kakashi-sensei's Chidori was based on the 4th's Rasengan, as for the reason, I want to teach it to Naruto. And before you ask why, i think it suits him."
"Sigh, fine. Just leave the blade here. We shall use it for an exchange with Kirigakure."
"Thanks, GG."
That day, Osamu got a hold of how to create Rasengan.
He used the 2 days rest to learn it so he can teach it to Naruto.
Unlike Naruto who took a week to learn it due to his massive chakra and very lackluster chakra control.
Osamu learned the Rasengan in a single day and tried adding his own chakra nature into the rasengan.
Rasengan is a complete chakra shape manipulation jutsu devoid of chakra nature manipulation.
On his first try, Osamu had the rasengan blow up on his hand.
After forming the rasengan with a single hand, Osamu added his lightning nature.
As soon as he did, lightning flickered and followed the energy swirling inside the rasengan.
However, the lightning and the swirling chakra sparked more and more, lighting up the rasengan.
Feeling that something wasn't right, he immediately fired the rasengan on the ground resulting in an explosion.
Speaking of which, Osamu already knew the Rasengan and how to do it.
The only reason he requested it is because he doesn't want the Hokage or anyone else become suspicious of him
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2 days later
Training Ground 3
"Alright, since you're all here. It's time."
The trio had serious expressions on their faces. Their sensei mentioned two days ago that their training will proceed to it's next stage.
Meaning, the training they have undergone with him was now going to be much more harder.
"The next stage of your training..."
"...is the shape and nature chakra manipulation.!"
"The what now?" Naruto, ever the clueless student asked.
And so, Osamu explained it. Then, he asked them to channel their chakra on the chakra papers he provided them.
As an example, he showcased his own water and lightning attributes.
"Huh? Osamu-sensei, if water and lightning is your attributes, then how were you able to perform a fire style during the battle back at the land of waves." Sasuke asked.
"I didn't say my only attributes are lightning and water. I am saying that my main attributes are water and lightning."
"Huh? What's the difference? You just said the same thing." Naruto complained.
"Naruto-kun, I think he meant that his main attributes are water and lightning means that besides those two, he can also use the other attributes but not as good as his main. Am I right, sensei?" Hinata explained to which Naruto had an epiphany!
"Correct! Good job Hinata." Osamu praised the heir of the Hyuga.
"So, as explained by Hinata, I can also use the other nature chakra which is not part of my main attributes. This applies to everyone. The only difference is that, if using your main attributes, it will feel like a walk in the park then using other attributes is like hiking the mount everest. Attainable but very difficult."
"This is also one of the reasons why most Shinobi tends to focus on their main attributes."
"Alright, now it's your turn! Time to learn your main attributes!"
The trio were enthusiastic as they poured their chakra.
Sasuke got the Fire and lightning.
Naruto got the wind.
And Hinata got the water.
Having anticipated this, Osamu already knew what to teach them.
"Let's start with Hinata."
Hinata nodded and focused on Osamu's instructions.
"Although you're clan focused more on your traditional techniques, your father and I, already had an agreement that I am allowed to teach you anything."
"Since that is the case, then this is the ninjutsu that I will pass to you."
Hinata watched as Osamu performed the water shuriken jutsu and on top of that used the water shuriken Kage bunshin jutsu.
Osamu created a clone who will train her and took her in a separate distance.
"Next, Sasuke."
The god of emo immediately came in front of him.
Osamu smirked and did the signature hand signs and held his hand down.
"You will learn this, Chidori!"
As soon as he finished chanting, electricity sparked on his hands as a chirping of thousand birds was heard.
"Wow so cool.!!!" Naruto exclaimed.
"Can I learn that too? Pls pls pls!!!?" Naruto immediately reacted and pleaded to Osamu who simply sealed him in place with a paralyzing seal.
With Naruto now quiet, Osamu created another clone who will train Sasuke and went to another different area within the training ground.
Now it was only Osamu and Naruto left.
With a simple gesture he broke the seal and Naruto immediately complained to which Osamu sealed him again.
This went on for a few more times until Naruto finally settled down.
"Now then, you will be learning something different."
"Oh, is it cooler than Sasuke?"
"Of course it is, it is after all, a jutsu created by the 4th Hokage!"
"Cool.! What is it, what is it?!"
Osamu smiled and simply gestured his hands to form the rasengan.
Naruto became excited and completely forgot about chidori.
And so, Team 7 trained for another 4 months while taking side missions.
All C-rank which they easily completed without a hassle. Osamu didn't even have to move much to his liking.
It's not like he was slacking off. He was also busy training himself albeit using shadow clones at home since his original is already taking care of his students.
End of chapter
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Chunin exam in the next chapter