The Third Hokage had used this technique during the Fourth Shinobi World War. Its power was incredibly terrifying because the clash of techniques from various elements created an explosion of such force that it was hard to resist.
Even the Thunder Dragon was immobilized at that moment by the Great Five Elements Squall Technique.
Satoru's physical strength was already at its limit. He couldn't hold back and spat out blood. He was incredibly stubborn; he craved victory, craved surpassing the Third Hokage in this very moment.
"Goro Goro no Mi! All my hope is on you!"
"Two Hundred Million Volts: Raijin!" the transmigrator finally revealed his final trump card. The voltage of this technique was more than three times greater than that of the previous Thunder Dragon. Since this attack exceeded his current capabilities, Satoru coughed up blood even as he unleashed it.
The Third froze in astonishment. He had never seen a four-year-old child fight so desperately. Seeing the gigantic thunder figure behind the system slave, resembling the boy himself, Hiruzen realized he had used his true, devastating technique.
"So that's your trump card... An attack of that power could destroy even a Kage-level expert, but... your current body won't withstand this technique," the village leader muttered under his breath.
Due to the deafening crackle of lightning around them, Satoru didn't hear a single word his mentor said.
The boy's consciousness was nearly fading. In that moment, he had only one goal—to defeat the Third standing before him.
The two-hundred-million-volt Raijin clashed with the Great Five Elements Squall Technique, and a horrifying scene unfolded immediately.
The four ANBU fighters maintaining the barrier were instantly hurled back by the shockwave.
A massive crater formed on the ground, and the edges of the Konoha Forest were charred—the result of contact with the lightning.
At that moment, the Hokage was breathing heavily, blood trickling from the corner of his mouth. His body was completely enveloped by the Diamond Staff, which had taken the form of Monkey King Enma. Enma, with his indestructible body, had protected the head of Konoha with his own.
Satoru, completely exhausted of physical strength, collapsed to the ground and lost consciousness.
"Th-this... how is this possible? Third-sama, did you kill this child?"
"Third-sama! You're injured! And quite seriously! What happened? Did you accidentally hurt yourself?"
"Was it him?! Did he injure you?"
Hiruzen nodded slightly and whispered,
"Don't stick your noses where they don't belong. Take him to the hospital right now and do everything possible to heal him!"
Several ANBU knew what to say and what not to, and they silently donned their masks.
Satoru felt his entire body aching with pain. Even opening his eyes was incredibly difficult.
As soon as he opened them, the System's voice rang out:
[Host, you're awake? Don't do that again next time.]
"What happened to me?" Satoru asked, somewhat bewildered.
[You're only four years old, and you used Two Hundred Million Volts: Raijin! What, do you think you're Enel? Even Enel can't use this technique whenever he feels like it! Was it worth risking so much just to beat the Hokage?]
"You told me myself to try to beat him," the boy objected.
[Yes. If I really wanted you to beat him, I wouldn't have said "try." You got lucky this time; that clothing significantly reduced the damage you took. Otherwise, you might never fight again.]
"Was it really that serious?" the transmigrator asked.
[Of course. The System rewards you with various abilities, but these are just their most basic forms. How far you develop them depends entirely on you.]
[Don't forget your age—you're only four. If you keep this up, you'll complete the mission, but it'll be like cutting off your own future. Don't do it again.]
The System thoroughly scolded its host.
And Satoru was the type who knew how to admit his mistakes, so he firmly memorized the System's words.
"Well, and now, how about the mission?" the transmigrator still hadn't forgotten his task.
[Your mission is considered very well completed.]
[Since you nearly beat the Third, this time the ability "Turning the Useless into Treasure" will be upgraded by one level. Do you want to exchange the Flying Thunder God Technique?]
Satoru naturally replied,
"Yes."
[Then I'll replace it with another reward and upgrade it by one more level! Consider it compensation for your reckless stunt this time. If it happens again, I won't help you.]
Satoru noticed for the first time that the System could be surprisingly human-like, and he immediately agreed to its terms.
[Host, hello! "Turning the Useless into Treasure" has randomly exchanged your ability for Indra Clan Blood.]
[Indra Clan Blood will allow you to fill in missing elemental chakra affinities and significantly enhance the power of Yin Release. Most importantly, you will directly awaken the Sharingan with one tomoe.]
[Moreover, in the future, it can evolve into a two-tomoe Sharingan, three-tomoe Sharingan, Mangekyo Sharingan, Eternal Mangekyo Sharingan, and Rinnegan.]
[This is also considered the most perfect eye technique in this world.]
The Earth native nodded in agreement:
"Indra's Blood is indeed a very good bloodline. However, if I use the Sharingan, I'm afraid it'll cause me problems."
The System replied:
[Simple. I can enable camouflage for you by default. No one in this world will see your Sharingan unless you want them to.]
Satoru shook his head:
"Of course not."
Satoru wanted to become Hokage, after all. He didn't want to incite hatred from the Uchiha clan at this stage. He also didn't want the Uchiha clan to be destroyed. He already had a good plan for the Uchiha, but now, naturally, it was still too early.
[Okay! Awakening complete! You may need some time to notice the changes and differences.]
[That's all for now. If a new mission appears, I'll show up again. Someone's coming.]
After those words, the System vanished.
To Satoru's surprise, standing before him was none other than the Third Hokage.
Since the boy was lying on a hospital bed, Hiruzen had come without his pipe this time, but accompanied by ANBU and in his Hokage robes.
"Teacher Sarutobi," Satoru nodded politely.
"Leave us for now. I need to talk to Satoru," the Third ordered.
The ANBU obediently withdrew, leaving no one else in the room.
"You little rascal! Hiding such a terrifying trump card! If you hadn't collapsed from exhaustion, I might have lost to you," the Hokage spoke without any arrogance, and in his half-joking words, it was clear he already held Satoru in very high regard.
"I'm very ashamed, teacher. What can I do? I'm still too small, my body too weak, I didn't have enough endurance to continue the fight, so I lost consciousness," Satoru said with a hint of grievance in his voice.
Hiruzen snorted discontentedly:
"I'm not going to blame you. I just think you're ridiculously strong. Even the First Hokage and Uchiha Madara didn't reach your level at your age!"
"By the way, if I'm not mistaken, you weren't just using Lightning Release, right?" the village leader asked very directly.
***
Read the story months ahead of the public release — early chapters are available on my Patreon: Granulan