Start with the Mangekyō and leave Konoha with Madara.

The sudden rain has just stopped, the night wind is moist, and every breath feels cool.

Senju Tobirama was holding a kunai, his body was tense, slightly bent, his eyes were sharp and alert, like a tiger ready to pounce.

He maintained this state for a long time, at least more than half an hour.

Around him, densely packed Flying Thunder God Kunai were scattered in various positions, the Amaterasu Black Flame had long been burned out, and the Four Red Yang Formation that was shooting straight into the sky was nowhere to be seen.

At midnight, the air was pleasantly quiet, with only the cool night breeze blowing gently.

"Tobirama!"

A shout disturbed the silence.

Tobirama's eyes moved, and he saw a figure approaching rapidly in the distance. Although he had already seen the man's face clearly, he still activated his detection to sense the man's chakra, and then he let down his guard slightly.

"It's Sasuke." He said in a hoarse voice, looking exhausted.

"Tobirama, the battle over there is over. The method used by that cat-transformer was too strange. I was unable to stop it."

"It's okay, it's just a summoned beast, it doesn't pose a threat." Tobirama ordered, a gloomy smile crossing his lips.

"Let the Hyuga, Ino, Deer and Chou clans all retreat back to the village. That Wuming has not shown up. Haha, this guy Madara has hidden her very well."

"I've asked my son to do it." Sarutobi Sasuke landed beside Tobirama, glanced at the kunai scattered all over the ground, and said, "That brat, hasn't been killed yet?"

As he spoke, he suddenly became alert and drew the long knife from his back.

"Who knows." Tobirama let out a long sigh, his face extremely pale. The Four Red Yang Formation consumed too much of his chakra. "Let's withdraw. He probably won't teleport back again."

"Is he still alive?" Sasuke was very suspicious, "If everyone attacks together, the chances of winning will be greater."

Tobirama shook his head. "It's useless. He has probably mastered 'Spiritual Transformation'. In front of that move, numbers won't give us any advantage. Our people will be killed like random soldiers. Besides, that kid's pupil technique is very strange. I can't let him adapt to the secret techniques of other families."

"You should understand, right? In the village now, apart from my eldest brother, only you and I are confident of dealing with him." Tobirama said, and he made a seal to remove the markings on his body. He did not have as much chakra as Hashirama, and in order to deal with Kamiya, he even flipped through the classics and spent three years to develop this forbidden technique that can store chakra.

Sasuke nodded silently. After a while, he said, "If he is not dead, he will definitely come back for revenge."

Upon hearing this, Tobirama said, "His ability allows him to teleport back to the track he left in space within a certain period of time, and repair any damage to his body."

"I moved him to the deep sea. I have been guarding here for a long time to prevent him from doing this."

"Deep sea!" Sasuke was shocked after hearing this, "You can actually leave a space mark in a place like that!"

"My kunai is specially made. It is made of deep-sea black iron. It is extremely dense. It is small, but it weighs a thousand pounds." Tobirama said, "Two years ago, I dropped it into the sea. Now I sense its spatial coordinates. It is about 20,000 meters away from the sea surface."

"That depth... is absolutely beyond the reach of human beings!" Sasuke couldn't help but shudder.

"I'm not sure whether he is dead or not. He may be buried in the deep sea, or..." Tobirama looked up, his eyes becoming distant, "survived and became a real monster."

Sasuke looked around again, looking at the huge crack on the stone wall and the messy, bumpy ground, and couldn't help but take a breath, "To me, he is already a monster now."

……

The North Sea, the country of iron.

The moon was high in the sky, the sky was filled with stars, the sea was surging, and huge waves were hitting the rocks one after another, splashing white water.

Suddenly, with a "pop" sound, a young figure leaped out from the sea at such a fast speed that he was like a rising missile and shot high into the night sky.

He cut off the huge waves and stretched his body under the full moon. The moonlight was cold and cast a layer of inviolable holy light around him.

The young man landed gracefully on the ground, his toes lightly tapping the surface of the sea, causing a circle of light ripples to spread out.

No matter how surging the waves are, once you get close to the water, it becomes as calm as a gurgling stream, as if a naughty child sees his teacher and instantly becomes silent, without causing any waves.

He had a handsome face, beautiful eyes, black hair swaying in the wind, and a pair of blood-red kaleidoscope eyes that were as bright as glass, reflecting a translucent glow.

It’s Shenyu.

At this moment, his upper body was naked, his skin was as white as jade, and his slightly bulging muscles were as refined as magic iron. Under the hazy moonlight, he emitted a misty halo, as if he was wrapped in a layer of crystal clear water film.

Shen Yu looked at his hands, put his five fingers together and clenched his fists, feeling the surging blood in his body and the tremendous power that was about to burst out, and a hint of excitement appeared in his eyes.

"I won."

"A life-and-death crisis can really inspire a person's potential..."

"Flying Thunder God's adaptation progress... is just a little bit short..."

The main reason why the previous battle with Tobirama was so dangerous was that he had not adapted to all the damage from Tobirama.

The "Moxu Luo" running at full power has been doing one thing from beginning to end:

Adapt...Flying Thunder God Technique!

He had a vague intuition that if Tobirama could perform Flying Thunder God in front of him again, he would immediately adapt to this divine space-time ninjutsu!

"It's not like there's nothing to gain..."

He shook his wet hair and looked at his smooth upper body with a slightly strange expression.

"Oh no, I'm the King of the Sea."

……

He succeeded.

He successfully adapted to the deep sea and the nature of natural water.

Moreover, this is the result after secondary optimization!

As soon as he decided not to sit and wait for death, he activated "Magic Hollow" with all his strength, so that part of the sea water shot in from the broken Susanoo, piercing his body in an instant, leaving it full of holes.

"Pfft! Pfft!"

Extreme pain also stimulates potential abilities.

While adapting to the sea water, he was also able to withstand more damage. In the end, he even let go of Susanoo and just returned to his own state.

"Gaba! Gaba!"

Bones shattered, flesh and blood blurred, and then recovered in the next second...

His bones and muscles were reconnected again and again, his blood dyed the sea red, and pain and rebirth were like two sharp blades, ravaging his body and mind, destroying and rebuilding them over and over again.

After repeating this several times, Shen Yu finally adapted to the deep sea under the extreme pressure on the brink of life and death.

During the first optimization, he grew gills, and the sea water was no longer salty. Even when he was at the bottom of the sea where he couldn't see his hand in front of him, he could breathe freely as if he were breathing air.

His body was strengthened beyond imagination:

The bones and flesh are extremely tough, and even the skin is glowing with a crystal-like luster. The seemingly thin body contains the power of a giant beast!

Every cell in his body is extremely strong and solid as a rock. It can even adjust the internal air pressure according to the external pressure. Neither the corrosion of sea water nor the terrifying water pressure can hurt him at all.

The circulatory system is upgraded, the heart pumps slowly and powerfully, like a divine drum from a distant heaven, and the body always maintains a constant temperature...

The evolution of his body from the inside out made him immune to all damage from sea water, and even allowed him to adapt to sudden changes in temperature and ignore the coldness of the sea.

Webbed fingers grew, providing the ability to swim...

In addition, his eyes have also evolved, greatly enhancing his vision in the dark and deep water, and can automatically adjust the viewing distance according to the light intensity! This allows him to see thousands of meters deep in the sea, and even see the deepest part of the trench;

During the second optimization, his gills and webbed feet disappeared, and his external features that were different from humans returned to their original state, replaced by...

All the acupuncture points in his body were opened, and he used the largest organ in his body to breathe - his skin!

It absorbs oxygen through its pores and then excretes waste water. Its cells can control the process of gas passing through the cell membrane, consciously absorbing oxygen from the water, and only absorbing oxygen...

He has increased his affinity for water and can subconsciously control water molecules within a certain range outside his body surface. He can manipulate them to maintain a stable density and water wave vibrations and control the speed of the water flow with great care and precision.

This is a completely natural reaction, similar to how human skin contracts when exposed to cold and dilates pores when exposed to heat.

This allows him to move freely in the water flow resistance and strong water pressure on the seabed, which is much better than using flippers to perform simple muscle exercises!

Not only that, when his attention is focused on "controlling water", he can control water molecules in a larger range. Within the domain, he is the master of water and controls the authority of the ocean!

Even in this deep sea, it is easy to control the water flow backwards and create a stable spherical "vacuum" zone out of thin air.

In addition, he has also evolved a perception ability, his chakra can be diffused in the form of high-frequency waves and then recovered, and he can obtain information about the surrounding environment through body perception!

Now, he is like a human radar, and can even detect changes in molecular density within a certain range. Combined with soul perception, he can see every detail within a radius of ten kilometers, and he will not collide with obstacles due to high-speed movement.

By this point, he had completely adapted to the seabed!

He was also able to catch his breath and took the opportunity to search in the sea. Finally, he found a severely deformed Flying Thunder God Kunai in a coral.

Looking at the Flying Thunder God Technique on it, he tore it apart without saying a word and then returned to the surface of the sea.

Shen Yu lowered his head and looked at his white and shiny palms. His gaze seemed to be able to penetrate his skin. Endless power was silently transmitted along his muscles and meridians.

As the owner of "Moxu Luo", he quickly adapted to this exponentially increasing power. The light in his eyes was completely restrained, and his breathing was steady and long.

With his current physical condition, he has the confidence to compete with Hashirama in person, but he can't get rid of that strange expression.

"Although becoming stronger is a good thing, but... am I still considered a human now?"