Once, when Hashirama Senju persuaded Uchiha Madara to found Konoha together, he said: "I've brought in the Sarutobi Clan."
Uchiha Madara then paled and replied: "What? You brought them in too?"
This shows the position the Sarutobi Clan held in Konoha.
Sarutobi Sasuke was the strongest in the Sarutobi Clan and father of Hiruzen Sarutobi. He not only had chakra of five natures but mastered changing those five natures perfectly.
Precisely because Sarutobi Sasuke was so strong and great, Uchiha Mikoto and Fugaku named their second son Uchiha Sasuke.
In history, Sarutobi Sasuke really existed and was leader of the Sanada Ten Braves in the Sengoku era.
"Yes, Sarutobi Sasuke's summoning beast was my father, the previous Monkey King. My father's power far surpassed mine. He not only had an indestructible body but immortality," the Monkey King said.
"You're asking me to save your father. But where is he?" Satoru, using Byakugan, looked around but found no especially strong monkeys. He only found a well emanating chakra aura.
The Monkey King stood and pointed to that well, saying:
"My father is in that well."
"Wait, why is your father there?" Satoru also realized the matter wasn't simple.
"This well is a barrier sealing mark. When our Monkey Clan arrived here, this well already existed. It has the ability to suppress evil chakra to a certain degree," the Monkey King explained.
"Evil chakra? Could it be that the Monkey King was consumed by it?" Satoru asked in turn.
"It's like this. I'll tell you in order. Do you know about the Second Shinobi World War?" the Monkey King asked.
"Go on," Satoru knew the Monkey King had something to say.
"In the Hidden Cloud Village, there was the Gold Horn squad and the Silver Horn squad. During the signing of the alliance treaty between the Cloud and Konoha, they suddenly attacked. The Second Raikage died, and the Second Hokage was wounded. In the end, the Second Hokage held off the Gold Horn and Silver Horn squads and passed the Hokage position to Hiruzen Sarutobi. And at that time, Sarutobi Sasuke came to help the Second Hokage alone.
"What?" Satoru hadn't expected this matter to have such hidden details.
"The Second Hokage's power was great, but due to the sudden attack by Gold Horn and Silver Horn, he sustained heavy injuries. However, to repel the enemy's attack, he desperately resisted. Lord Sarutobi Sasuke, hearing this news, rushed to the battlefield with all his might and fought shoulder to shoulder with the Second Hokage," the Monkey King said.
"Wait, how did Sarutobi Sasuke learn of this news? And if he went to help, why did the Second Hokage still die?" Satoru immediately questioned.
"The sudden attack by the Gold Horn and Silver Horn squads was swift and extremely shocking. Very soon, all of Konoha knew the news. Chaos broke out in the Hidden Cloud Village, so they immediately selected the Third Raikage. And the Third Raikage, leading the army, intended to attack the Gold Horn and Silver Horn squads.
"In Konoha, Lord Sarutobi Sasuke was initially in charge. But to save the Second Hokage and his children, he still decided to go help.
"Sarutobi Sasuke's movement speed was too high; no ninja could keep up with him. Very soon, Sarutobi Sasuke found the Second Hokage and his students.
"Lord Sarutobi Sasuke and the Second Hokage unanimously decided that these new forces of Konoha must be protected. So Lord Sarutobi Sasuke distracted Silver Horn and his squad with all his might, while Lord Second Hokage alone distracted the Gold Horn squad.
"Sarutobi Sasuke and Silver Horn engaged in a fierce duel. Because the movement had drained a lot of strength, the enemy had plenty of reinforcements, and moreover, Silver Horn possessed the Nine-Tails' chakra—his power was terrifying, and he even had Sage of Six Paths weapons like the Red Gourd and Seven Star Sword. In the end, Sarutobi Sasuke was sucked into the Red Gourd. But before that, Sarutobi Sasuke sealed Silver Horn's Nine-Tails chakra into my father's body and canceled the Summoning Technique.
"What happened next, you roughly know. My father jumped to the bottom of this well because only that way could he suppress the raging Nine-Tails chakra in his body. But the well's suppressive effect is limited. I sense that my father has already been changed by this Nine-Tails chakra. I need someone who can save my father," the Monkey King said.
"Then why didn't you go to the Third? He's the Hokage. Or maybe you went to Jiraiya and the others..." Satoru still didn't understand why he had to do this.
"Mount of Flowers and Fruit is a magical place. Those who have signed summoning contracts can't enter here. Jiraiya, Tsunade, and Orochimaru have contracts. The Third is the Hokage; he can't risk himself. You, first, have no contract; second, have power; third, have good relations with the Monkey Clan. I had no choice but to ask you for help," the Monkey King finally explained in detail.
"So, what do I need to do? Jump to the bottom of the well, find your father, and then pull him out?" Satoru asked.
"More or less. But my father is too heavy. Even you probably can't pull him out.
"Then what to do?" Satoru was also puzzled. His instant teleportation didn't allow carrying others.
"It'll be very hard for you to pull him out. However, Lord Sarutobi Sasuke is already dead. You just need to convince my father and make a contract with him. That way, you can turn him into the Diamond Staff and carry him up," the method proposed by the Monkey King was quite feasible.
"Is it really that simple?" Satoru was skeptical.
"Of course not. As I said, my father may already be consumed by the evil chakra. This well only suppresses it temporarily. So when you go down, there might be some danger. My father isn't easy to talk to," the Monkey King said.
"Got it. So, after going down, I might have to fight your father, then convince him and make a contract?" Satoru asked.
"Yes! Exactly!" The Monkey King nodded.
"It's a shame you didn't ask Naruto Uzumaki about this," Satoru couldn't help remarking.
"Naruto Uzumaki? Who's that? From the Uzumaki Clan?" The Monkey King was very puzzled. He'd never heard that name.
"Nothing, nothing," Satoru ignored the Monkey King.
"Satoru! Please!! A little longer, and the Monkey Clan will be destroyed by my berserk father... Truly, there's no better candidate," the Monkey King said.
"I'm so small. Don't you feel bad sending me to my death?" Satoru pouted. He really didn't want to go, but since they'd lured him here, if he didn't go, he couldn't return!
"Fine! I'll help!" Satoru finally nodded in agreement.
In truth, Satoru wanted to help the Monkey King mainly because he was interested in the matter.