Awaken the Sharingan, kill Muzan and open your Mangekyō!

Eye Technique: Nightmare!

Ignoring Shinobu Kocho's teasing, Uchiha Isha directly activated the eye technique Nightmare and knocked Shinobu Kocho down.

With the successful activation of the nightmare,

Shinobu Kocho's eyes quickly became dull.

Her eyelids also closed heavily, and the whole person fell to the ground.

Uchiha Isha took two steps forward quickly and supported Shinobu Kocho's body. By the way, he caught the Douma relic that almost fell to the ground from Shinobu Kocho's hands.

This scene, from a distance, looked like Shinobu Kocho took the initiative to throw herself into his arms.

Not to mention whether anyone would misunderstand this.

However, this scene was clearly seen by someone.

And that person was Kanao.

""Brother Yixia, Sister Shinobu?"

Kanao, who just walked out of the Butterfly House, opened her mouth slightly and widened her eyes.

She was quite surprised by her sister Shinobu's embrace. She also had an indescribable feeling.

"She is just like you were then!"

"Calculating the time, it will take some time before waking up"

"Kanao, please send her to her room first!"

Uchiha Isha said to Kanao.

"Oh oh!"

Kanao nodded subconsciously.

Uchiha Isha's explanation in a few words had already made her understand something.

Her sister Shinobu was meeting her other dead sister, Butterfly Kanae, in her dream, and she was telling them what she had always wanted to say.

"Then I will take Sister Shinobu back to her room first!"

Kanao took her sister Kocho Shinobu's body from Uchiha Isha's arms and was about to help her back to the room

"Okay, be careful."

Uchiha Ixia said.

After that, he watched Kanao send Kocho Shinobu back to the room.

"I hope you can see the 'real' Kanae!"

Uchiha Isha thought.

The reason for saying this is based on his analysis and speculation of what happened to Tanjiro and Akaza before.

Although it was a dream created by illusion and eye technique, for both of them.

Tanjiro got the help of his dead family to get rid of the illusion, and Akaza was suspected to have been redeemed by his family, master, and wife who also passed away.

The reason for this may be that people who enter a certain special state due to the power of the Sharingan can see their deceased family members and relatives around them in this special state.

If so, Shinobu Kocho should be able to truly meet her sister Kanae Kocho who has been guarding them all the time in her dreams.

And this will be a great thing.

With this expectation, Uchiha Isha also entered the Butterfly House.

At the moment when Shinobu Kocho fainted, he needed to hand the experimental materials to Tamayo in person.

……

There was no need to look for Tamayo's laboratory.

As expected, it was right outside Kocho Shinobu's laboratory. In fact, it was indeed the case.

When he arrived outside Kocho Shinobu's laboratory, Uchiha Ixia had already sensed the presence of a traitor.

Moreover, there were three of them.

"Could it be that Nezuko is here too?"

Uchiha Isha raised his eyebrows slightly, thinking of this possibility.

Tamayo and Yushiro have already occupied two of the places, and he couldn't think of anyone else except Nezuko for the remaining place.

Unless, Kocho and Tamayo are using a captured ghost for a live experiment.

But low-level ghosts actually have no value or necessity for live experiments.

After all, the poisons they have developed now can have a huge effect on upper-rank ghosts.

Let alone low-level ghosts.

Therefore, it is even more possible that it can only be Nezuko.

"who is it?"

"What are you doing sneaking around like that!"

Uchiha Isha's sudden arrival and lack of movement made Yushiro in the room quite alert and irritated.

He opened the door and walked out, shouting

"Yushiro, don't be rude!"

Almost the next moment, another scolding voice came from the house, stopping Yushiro's rude behavior.

This was Tamayo's voice.

After seeing Uchiha Isha outside the house, Tamayo was stunned at first, and then her face was full of surprise and expectation.

"You are the Sun Breathing Swordsman that Mr. Ubuyashiki mentioned, right?"

Tamayo bowed respectfully.

In fact, she did not know Uchiha Ixia, nor had she seen Uchiha Ixia.

At most, she had heard about Uchiha Ixia from Tanjiro, Ubuyashiki Yoya, and Kocho Shinobu.

The reason why she could recognize him at a glance was because Uchiha Ixia was too similar to that person.

Whether it was the flame-shaped markings on his head or the aura on his body, Uchiha Ixia looked very much like Yoriichi Tsugikoku, who almost killed Muzan Kibutsuji during the Warring States Period.

""Yes!"

Uchiha Isha nodded slightly.

He was not surprised that Tamayo could recognize him.

"You are the one……"

Yushiro was still not able to react when he heard his Lord Tamayo say this.

The Uchiha Isaka who was"sneaking" outside the door was the Sun Breathing Swordsman who had killed many upper-rank demons in the Demon Slayer Corps.

This also made him, who always disliked being disturbed when he was alone with Lord Tamayo, less impatient and more solemn and admiring.

"This is the blood and eyes of the Second Upper Moon, Douma!"

"I had originally given it to Kocho Shinobu, but she has something to do now, so I will go there myself.

Uchiha Isha did not say anything else.

He directly took out Douma's relics and gave them to Tamayo.

"Another Upper Rank, and the Second Upper Rank?"

Tamayo's beautiful face was full of surprise, and then turned into full of surprise.

When she first received the invitation from Ubuyashiki Kayuya, she was very nervous.

Although she had contact with the Demon Slayer Corps and her relationship with the Demon Slayer Corps was relatively good.

However, the only thing that maintained their relationship was letters, and there was no personal contact.

She was inevitably a little wary of Ubuyashiki Kayuya's invitation, and even wondered if this was a trap.

But in order to kill Muzan Kibutsuji, she finally chose to believe Ubuyashiki Kayuya and accepted his invitation.

Of course!

There was another reason that prompted her to make such a decision..

That is... the Breathing of the Sun!

She didn't expect that the Breathing of the Sun that made Muzan Kibutsuji so afraid would appear again in this era.

One of them is Tanjiro, who is good friends with her.

And the other one is a being powerful enough to kill the upper-rank demons.

That is... Uchiha Isha.

She also got the blood and materials of the lower-rank demons and upper-rank demons from Uchiha Isha.

This also brought her to the current Demon Slayer Corps, where she started research with Shinobu Kocho and achieved amazing results.

The breakthroughs and achievements she made during this period of time can be said to be several times more than the previous hundred years.

This also made her glad that she made this choice.

"That's great!"

"With the blood and materials of the Upper String Two as materials, we can also further adjust the poison."

Tamayo took the materials of the Upper String Two from Uchiha Isha with full of surprise.

"How is the current progress of the poison?"

After Tamayo collected Douma's materials, Uchiha Isha asked Tamayo.

Regarding Tamayo and Kocho Shinobu's research, although he, as a time traveler, knew the exact poison and its effect, he didn't know their specific progress in detail.

"Our joint research is a combination of multiple poisons."

"There are four types of poisons, which can turn ghosts into humans, accelerate the aging of ghosts, prevent ghosts from dividing, and destroy ghosts' cells."

"The second and fourth poisons have been studied almost completely, so we just need to make some adjustments."

"The third poison is about to be completed."

"As for the first one, it is still somewhat difficult and requires further research and some time."

Tamayo spoke slowly and leisurely.

It can be said that the poisons she and Shinobu Kocho studied together were all specially designed to restrain Muzan Kibutsuji.

No matter which one it was, it was a powerful weapon against Muzan Kibutsuji, and none of them could be missing.

Among the first three poisons she developed: the first and second poisons were used to consume Muzan Kibutsuji's strength, so that the swordsmen of the Demon Slayer Corps would have enough strength to fight Muzan Kibutsuji.

The third poison was to prevent Muzan Kibutsuji, whose strength was greatly reduced, from escaping, just like Muzan Kibutsuji escaped from Yoriichi Tsugikoku during the Warring States Period.

As for the last fourth poison, it was the poison developed by Shinobu Kocho.

This poison can wait until Muzan's strength is running out, and give Muzan a fatal blow with a very sudden and fierce poison.

This is also what Shinobu Kocho is good at.

Even if Muzan Kibutsuji can hold on, the Demon Slayer Corps can easily kill him.

With so many preparations, she didn't believe that Muzan Kibutsuji could not be killed.