The pirates sat and forgot, and they really believed the nine truths and one lie.

In Leviathan's belly, there is no distinction between day and night. The only thing that can provide lighting is a group of spore creatures that live in symbiosis with whales.

At a specific time every day, these spore creatures will appear in groups to clean up all kinds of residues in Leviathan's body.

When spore creatures are eating, light will appear at the end. Based on this habit, Uchiha Izuna determined that this time was daytime in the whale world and started his day's work with the help of the light.

The brother and sister who were rescued were also awakened by the white light outside. Their biological clocks had not yet adapted to this environment, but their bodies had already rested for a whole night, and it would be unreasonable for them to stay in bed now.

The breakfast prepared by Uchiha Izuna was grilled fish. He had gotten used to eating fish three times a day over the years. He would have been tired of it a long time ago, but he had to eat fish to fill his stomach.

Who made Leviathan, the giant whale, love seafood so much and dislike human food? Humans are just parasites in his stomach and he has no choice in dishes.

Guang sat next to her brother, watching Uchiha Izuna use fire jutsu with one hand to grill fresh fish for them. The girl couldn't help but ask curiously: "What kind of power is water jutsu and fire jutsu? Why are there so few people using such useful moves at sea?"

Uchiha Izuna handed the grilled fish in his hand to the girl, and while grilling the fish for Charlotte Katakuri, he explained: "There are not only water jutsu and fire jutsu in the world. In the beginning, when there were no devil fruits in the world, everyone needed to absorb natural energy and convert it into various attributes of moves to engage in large-scale wars."

The old man motioned for Guang to use the Mangekyō Sharingan to look at him. When performing Fire Release, the energy fluctuations in Uchiha Izuna's body would be very violent.

It will absorb a large amount of energy from nature, merge it into the body, and finally gather it in the throat. It will then form seals to convert the energy into flames. Uchiha Izuna can control the temperature of the fire he spews from his mouth at will.

Charlotte Katakuri was eating a grilled fish and didn't say anything. He felt that his savior was teaching his sister knowledge, and he shouldn't interrupt their conversation easily at this time. As a brother, he wouldn't do such a stupid thing.

"Hand seals are just a way of using natural energy. Later it was called Ninjutsu, but later generations changed the name based on the previous ones. In essence, it is a degraded version of immortal arts."

It was unknown how many years the old man Uchiha Izuna had lived, and he knew all these ancient secrets at his fingertips. Guang and his brother felt like they were listening to a story, with so much information flooding into their minds that they were unable to distinguish the truth from the false.

At least thousands of years ago, ancient people had not heard of devil fruits. In order to overcome the harsh natural environment and for the human race to survive, our predecessors explored a completely new path.

Using the body as a container to absorb energy from nature, most people would explode and die at first. It was not until a huge price was paid that experiments revealed the limit of what the human body could withstand.

When the body is filled with natural energy, it becomes extremely strong and can tear a Tyrannosaurus Rex apart to defeat most predators, thus preserving the human tribe.

As for how to fully mobilize the natural energy in the body and form seals, we have to mention the origin of the Uchiha clan.

"According to the records on the Uchiha clan's stele, the earliest members of the clan were just like ordinary humans. After an ancient female member of the clan had a union with an alien creature, she gave birth to the first member of the clan who was born with red pupils. That day was the beginning of the rise of the Uchiha clan."

The first member of the tribe to open his eyes and possess the Sharingan has been able to call upon natural energy at will since he was a child. He has also learned many hand seals without a teacher and left behind many methods to convert natural energy into attribute attacks. From then on, he has been invincible in wars.

Some of the children born to women who had married with this ancestor were qualified to open their eyes, and more female tribesmen were assigned to give birth to offspring. Those tribesmen who did not open their eyes were marginalized.

After a round of artificial screening, the Uchiha clan was completely bound to the Sharingan, thus opening an era belonging to their clan.

It is possible that due to the serious problem of inbreeding, the Uchiha clan was home to many crazy people for a period of time. The Uchiha clan surpassed other members of the clan in terms of psychopathy and cruelly exploited other humans.

They possessed powerful forces to rule the weak and proactively triggered a large number of wars on the Mu Continent. They fought for nearly a hundred years for territory, population and living space, and racial hatred intensified.

The price was that large numbers of tribesmen died, and some of the children born later were deformed. It was difficult to even raise them, let alone allow them to open their eyes.

Finally, under the siege of all the forces of Mu Continent, the Uchiha clan could only flee to an island with the remaining members, completely away from that supercontinent, thus avoiding the disaster of genocide.

“Does the island where the tribe fled still exist?”

Uchiha Izuna sprinkled some salt on her fish, replied while eating: "That large island has never changed its name. It is still called Wano Country today. You should have heard of it."

Wano Country?!

The brother and sister had not only heard of it, they were very familiar with the place. It was the largest territory of the Beasts Pirates, and Kaido had made a fortune by protecting this precious land, and would not allow outsiders to interfere.

Charlotte Katakuri raised his hand very politely. He had more doubts in his mind. Although Wano Country was a closed island country, he had been there with his mother and had never seen any Uchiha members there.

If the Uchiha clan was really as powerful as the legend says, Kaido, the King of Beasts, would not have had the chance to rule the Country of Wano and turn that island country into a weapons factory, with men working like slaves in black factories and women selling their bodies.

"Your eyes evolved into the Mangekyō Sharingan. You should be familiar with Susanoo. The ultimate form of the perfect Susanoo is that of a samurai general. The lord of Wano Country has always been called the general, and that's where the origin comes from."

After listening to Uchiha Izuna's explanation, the brother and sister suddenly realized that there were so many twists and turns involved.

Light is not strong enough to use the complete form of Susanoo, but when he attaches this power to his brother, the armor and samurai sword that appear are quite similar to those of the generals enshrined in Wano Country.

"The Uchiha clan has committed too many sins in history, and now they have been exterminated, which is what they deserve. You don't need to delve too deeply into it. The change of the master of Wano Country is definitely a good thing for the people living on the island."

Uchiha Izuna is different from other Uchiha lunatics. He is an outlier in this group. He hopes that all races can live in harmony and pursue a world of great harmony with truth, goodness and beauty.

To put it bluntly, he was a bit too chaste, which indirectly led to his survival until now, becoming a lonely ghost in the belly of a whale, forgotten by the world.