The timeline is set just before Boruto attends the Tailed Beast meeting.
The moonlight inked the sky, and the sea stretched out like a smooth, flat, black floor, occasionally disturbed by fish breaking the surface.
The classmates, exhausted from the night's commotion, gradually grew weary. A few who couldn't stay up had already gone to bed. Iwabee and the others continued playing games, while Mitsuki leaned against the windowsill, admiring the moonlight.
On the observation deck, Boruto and Sumire Kakei quietly stared at the moon, its pale yellow light illuminating them. They were silent, simply standing close together.
The sea breeze carried a gentle dream, and the moon blurred their thoughts. They seemed to be in sync, as if intoxicated by the moonlight.
After a long while, Sumire emerged from her reverie and asked with slight worry, "Will Mitsuki be alright?"
"Trust his strength. I've already familiarized him with the feeling of being underwater. I believe he'll have a foundation for underwater combat," Boruto replied softly.
"So, the fishing trip was just an excuse?"
"Cough, cough." Boruto coughed softly, his purpose having been guessed, and then changed the subject, "But this kind of atmosphere is good too, at least I don't have to trouble you to keep an eye on the classmates."
"Uh~!" Sumire was stunned for a few seconds.
Her shyness made the quiet atmosphere even more silent. Amidst the sound of the tide, Boruto used his Jōgan to see through the heavy surface of the sea, and began to observe the underwater situation.
Realizing that Boruto had entered his zone, Sumire didn't bother him and quietly watched him. His skin was much paler than usual, and his yellow hair fluttered gently in the sea breeze.
Her eyes held only his reflection, not even a sliver of moonlight could intrude.
In the sea, Mitsuki was completely submerged in the water, the touch was somewhat cold, stimulating his nerves and making his mind more focused.
He silently descended, holding the scroll Boruto had given him, which was said to be specifically for imprisoning the Three-Tails Isobu.
As he descended to a certain depth, the water pressure rapidly increased dramatically, exceeding the limit that the human body could withstand, so Mitsuki unhesitatingly activated Sage Mode!
Emerald green Chakra spread throughout his body, enveloping and protecting every inch of his skin, resisting the pressure from the seawater.
A small snake was perched on his shoulder, protected by Sage Mode. The small snake flicked its tongue from time to time, accurately guiding Mitsuki to Isobu's location.
At some point, Mitsuki, who was leaning against the windowsill on the cruise ship, opened his Sage Mode eyes. There was also a small snake lying on the windowsill in front of him, conveying the information in his mouth to Mitsuki in the sea.
They cooperated with each other, so tacitly that they seemed to be two individuals split from one person. Mitsuki trusted 'Mitsuki', so the Mitsuki in the sea carried out the instructions of 'Mitsuki'.
Soon he descended to a considerable position, the pressure of the sea was so great that even Sage Mode was difficult to support, and the small snake on Mitsuki's shoulder began to moan in pain.
After all, in terms of physical strength, it was weaker than Mitsuki.
So, lightning began to emerge from Mitsuki's body. These dense lightning bolts between the blood vessels and cells were stimulating the activity of his skin and cells, enhancing the body's resistance.
"Okay, Boruto, I have already sensed the approximate location of Isobu. Although it is vague, I guess I am still far away from it, but I don't need you to guide me anymore."
'Mitsuki' in the cruise ship was silent for a moment, and instructed: "Be careful, and keep in touch at all times."
"Okay." Mitsuki responded, and then let the small snake on his shoulder go back to rest.
Five hundred meters underwater, Mitsuki continued to descend through cell activation. Six hundred meters underwater, barely reaching Mitsuki's limit, but he continued to sneak without stopping.
At a depth of six hundred and fifty meters, Mitsuki's body was severely compressed and began to be unable to withstand the strong pressure. After realizing that he had completely reached his limit, Mitsuki raised his hands with difficulty and slowly formed a seal.
——Dragon Cry: Sage Mode!
The emerald green Chakra was a bit brighter, like a small sun on the seabed, illuminating a large area of the sea.
Several small snake-like entities of Chakra appeared around his body, and there was a tendency for them to slowly turn into dragons, which gave Mitsuki a more powerful defense capability.
The density of Sage Chakra was completely different from before, and even faintly catching up with the resistance of Nine-Tails Chakra Mode!
This allowed Mitsuki's diving depth to soar to nine hundred meters in one breath. He had initially sensed Isobu's location and began to move purposefully.
At this time, Isobu, who was sleeping in the deep sea, was suddenly awakened. It sensed a terrifying Chakra approaching, which was obviously coming for it.
Could it be someone from 'Moon'? I specifically dived into the deep sea, and they can still chase after me?
After the last Tailed Beast meeting, in order to ensure its own safety, it began to move towards the deep sea. Although one thousand meters was not its limit, wasn't this deep sea too terrifying?
To humans on the outside, it was a huge monster, but in the deep sea, it found that it was as small as those humans. There were countless creatures several times larger than it, and some creatures were even very aggressive.
Last time, a whale almost swallowed it alive, fortunately Isobu knew ninjutsu, and the whale couldn't resist it!
Sensing the danger approaching, Isobu unhesitatingly fled towards the depths of the sea. It didn't believe that a mere human could really ignore the pressure of the seabed!
Mitsuki also discovered this situation, and his brows couldn't help but wrinkle slightly. It would undoubtedly be a fool's dream to compete with Isobu's resistance in the sea.
After thinking about it, Mitsuki took out the scroll Boruto gave him. Boruto on the observation deck sensed that the ninja tool left for Mitsuki had been activated.
"What's wrong?" Sumire asked, noticing the abnormality.
"It's nothing, Mitsuki encountered a little trouble." Boruto replied.
And instantly condensed Sage Chakra to enter Sage Mode, he pinched his hands, and the ninja tool in the deep sea established contact with him.
In Mitsuki's sight, four black rods were thrown out of the scroll and shot straight towards Isobu's direction, far exceeding Isobu's speed.
So, Isobu was undoubtedly caught up by the black rods, and instantly dispersed and placed in the four directions of Isobu. As Boruto snapped his fingers on the sea, amazing lightning emerged from the four black rods, and supported a barrier that surrounded Isobu.
——Sage Art: Lightning Release: Illusionary Lightening World!
The crackling lightning pulled up a curtain in the sea, covering Isobu in lightning, like protection. In fact, the moment the barrier was erected, Isobu lost its sense of the outside world.
It waited vigilantly, with a surprisingly dense Tailed Beast Ball already brewing in its mouth. After a while, Mitsuki arrived at the location of the Illusionary Lightening World.
Mitsuki saw Isobu condensing the Tailed Beast Ball, and Isobu naturally saw Mitsuki too. It couldn't help but show a provocative look, as if to say, come in if you dare!
Mitsuki merely placed his hand on the barrier of the Lightning Release barrier, simultaneously channeling a large amount of Lightning Release Chakra to activate the barrier. Lightning from all directions connected to form chain-like lines, binding Isobu within the barrier.
However, this still didn't prevent Isobu from releasing a Tailed Beast Ball.
Amidst the humming thunder, the Three-Tails glared at Mitsuki outside the barrier. It even abandoned struggling against the chains binding its body. The power of lightning traveled across its surface, burrowing into its body along its skin.
It was waiting, waiting for Mitsuki to be unable to hold on and enter the barrier.
Because the pressure of the deep sea was constant. As soon as Sage Mode was released, he would instantly be crushed into a mass of flesh.
But this Lightning World cleverly isolated the pressure of the deep sea. Entering it was like entering an ordinary reservoir, with no need to worry about being crushed by the pressure.
And Isobu sensed this, which was why it calmly gathered the Tailed Beast Ball.
Mitsuki, deep in the sea, was also quite calm. Facing the 'salvation' so close at hand, he didn't rashly enter, but he wasn't too worried either, because Boruto would help him solve all the problems!
"I say, Three-Tails Isobu, we can talk," Mitsuki said, withdrawing the chains that had entangled Isobu to show his sincerity.
"Human, don't play these tricks. If you really want to talk, why not come in and speak further? Look, there's even a special curtain here."
Isobu said, pointing to the barrier with a cold voice.
"If I come in, you'll talk to me nicely?" Mitsuki asked.
Isobu agreed almost without hesitation, "As long as you come in, we'll chat slowly."
"Alright then!"
Mitsuki gently pressed on the Lightning Release barrier, slowly inserting his entire arm into the barrier, followed by half of his body, and finally squeezing his whole body into the barrier.
The pressure of the deep sea vanished in an instant. One second his body was in a state of high tension, and the next second his whole body was comfortable, with an unspeakable sense of ease.
And Isobu finally revealed its true intentions at this moment. It waited patiently for Mitsuki's entire body to enter the barrier, and then launched the Tailed Beast Ball without hesitation.
"Die, you detestable human!!" Isobu said excitedly.
"..." Mitsuki had an expression as if he had expected this.
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