Becoming Hokage was Uzumaki Naruto's original dream, and it was a goal he pursued tirelessly as a means of gaining recognition. Before Sasuke defected, retrieving his companions, at least for now, was not on Naruto's agenda.

Kakashi Hatake's words immediately scared Uzumaki Naruto.

"Naruto, if you want to be Hokage, it's not enough to just learn a few powerful ninjutsu. There are many things to learn."

"I know." Naruto, who was hit hard, replied dejectedly. "I will study hard when I get back."

"Go back?" Shuimu said, "I have it here. Do you want to take a look right away? It's written in great detail."

Mizuki's teasing enthusiasm immediately frightened Naruto.

"No, we're still on a mission. It's not good to be distracted. Hahaha..."

"That's such a pity..." Mizuki pretended to withdraw his hand that was reaching into his arms to take the ninja manual.

Hatake Kakashi glanced at Mizuki, and then said, "Just now we talked about the ninjas of the Land of Water. Many of them do not follow the rules, which leads to a very unstable order in the Land of Water. If fighting between ninjas from other countries is still cautious and rarely affects innocent people, many Mist ninjas do not have so many considerations. It can be said that in the Land of Water, the lives of civilians are the most difficult, and the ones who bring them trouble are precisely the ninjas of the Hidden Mist Village who are supposed to protect them."

"how so?"

Kakashi Hatake's words really shocked a group of Genin who had received orthodox ninja education in Konoha Village. Under the current system of one country, one village, it was hard to believe that the ninja village, which was regarded as the highest military guarantee, had become a burden or even a scourge to its own country.

Kakashi looked around and saw that the Mist Ninjas were not paying attention to this side, so he continued, "Although this kind of thing is rare, it does happen occasionally. There are many reasons for it, so I won't go into details. But the situation in the Hidden Mist Village is probably caused by the ninja selection policy that has been circulating for a long time, especially the bloody policy that has intensified in recent years. There are also many conflicts between ordinary ninjas and ninja families with bloodline limits, which led to this phenomenon. In the closed Land of Water, the living conditions of ordinary people can actually be roughly inferred."

"I know this. Zabuza mentioned it when I met him in Wave Country, and also Haku..." It was a rare topic that he knew about and could join in the conversation, so Uzumaki Naruto couldn't wait to speak.

Hatake Kakashi nodded: "The 'Demon' Zabuza can be said to be the most typical assassin-type ninja cultivated in the 'Land of Blood Mist'. He has been a 'fighting machine' who has lost most of his emotions in cruel killings since he was a child. Do you think anyone would like them? In the Land of Waves, if he didn't need Cardo's money or even a shelter to avoid being hunted down, Cardo would have been killed by Zabuza long ago. And Haku is another concentrated embodiment of the tragedy caused by the bloodline limit..."

"Bloodline limit? Tragedy?" Uchiha Sasuke, who had been taciturn ever since he left the village to start this mission, seemed to be quite interested in these two words.

Kakashi seemed prepared for Sasuke's attention: "How should I put it? In the village, you may not feel it obviously, but bloodline limit is not always a good thing."

After a pause, Kakashi continued, "In the Land of Water, there is a very famous bloodline limit family. They possess the bloodline limit that is said to be the strongest physical skill - the Shikotsu. They are also well-known in the ninja world and are known for their warlike nature. Any ninja with a little knowledge has heard of their strength..."

"Corpse bone vein? It doesn't sound very pleasant. How come I haven't heard of it?" Bloodline limit is already rare to see, but it is a bit strange that there are no rumors about such a legendary powerful family.

"I haven't heard of it. The reason is that they are all dead." Kakashi said in a deep voice, "The Hyuga clan, who inherited the Corpse Bone Vein, has the ability to fight using all the bones in their body and an amazing physical talent. Coupled with the fighting skills passed down in the family, almost everyone of them has become a master of physical skills. However, in a crazy rebellion, they were blinded by the desire to fight and the entire clan died in battle. They were killed completely."

"Extermination of the entire clan? Is it that simple?" Sasuke was a little dissatisfied with this vague explanation.

"Bloodline limit is a kind of mutation that occurs in people. Sometimes it is not necessarily a good thing. For example, this corpse bone vein is accompanied by an insurmountable battle frenzy, and even a bloodline disease that is almost incurable."

"Bloodline disease?" Almost everyone knew about bloodline limit, and there were very typical Sharingan and Byakugan on the scene. But the term "bloodline disease" had never been heard before.

"Do you think that all bloodline limits are like the Sharingan and the Byakugan, with minimal or even no side effects? Sasuke, for example, the Haku you fought against, possessed the Ice Release, inherited from his parents. When the bloodline limit was awakened, he was still an inexperienced beginner. He might hurt others or even himself because of poor control. Many of these sudden and powerful bloodline limits can even directly kill relatives around them..."

"How could this be?" This news, which had never been known to anyone in the past, suddenly broke the common sense of these Genin.

"These are just some common examples. There are many unheard-of and astonishing bloodline limits in the ninja world. You will encounter them in the future..."

Seeing that the topic was becoming more and more serious, Shuimu couldn't help but interjected: "Okay, Kakashi, these things will naturally be understood when they encounter them. It's too early to talk about this now."

"That's right. Let's not talk about it anymore. It's getting late. You should go to bed early. You've been bored on the boat all day and you must be very tired."

…

After several Genin left, Mizuki couldn't help but complain: "You talk too much, Kakashi..."

"A lot? It seems a little inappropriate, but it's not a big problem..." Kakashi replied.

"Bloodline limit, extermination of the clan, are you insinuating that?" Mizuki couldn't help but remind him, "Talking about too many sensitive issues will not do any good to these Genin, especially Sasuke."

"I know, Mizuki, but don't worry too much."

Not worried? Mizuki was a little helpless. Hatake Kakashi, who didn't know much about the inside story of the Uchiha clan's extermination, didn't understand how much trouble this matter involved. It was best not to mention anything related to the original incident at any time.