The librarian, who was the champion of the World Swordsmanship Championship, traveled to the world of Demon Slayer during the Warring States Period, awakened the Great Swordsman System, and became a disciple of the Jigoku brothers.

From then on, he created various legends of his own in this world!

Muzan Kibutsuji: Facing Yoriichi, I can still escape, facing the librarian, I have no choice but to die! Yoriichi Tsugikuni: Your strength has surpassed mine! Demon Slayer Corps: The librarian is the most powerful man!

Suibian! A young man with a very casual name, living a casual life. Then, he was casually killed by a flower pot, and thus entered the world of Demon Slayer! He became Tokito Muichiro's older brother, Tokito Ichiro! From then on, his life began to be more than casual...

When Tanjiro Kamado stepped into Nada Spider Mountain, a huge screen appeared in the sky.

The question-and-answer system has officially started. As long as you answer the questions, you can get various rewards, including but not limited to "resurrection", "turning back into a human", "blue red spider lily", etc., to solve your unsatisfactory wishes!

After resurrecting his wife, Akaza said: "I am Fist Pillar. Muzan, I will *your Sage!"

Shinobu Kocho: "I have a gentle personality? Wait until I get the reward and you will know what a killing angel is [sinister smile]."

Agatsuma Zenitsu: "Grandpa was forced to commit suicide? I'll show you what a fucking thunder pillar is! What a fucking thunder pillar is!"

Douma: "The punishment is to experience extreme pain? There's such a good thing?!"

Mitsuri Kanroji: "Eh?! Mr. Iguro likes me? Then I'll confess right now!!!"

Kokushibo: "I want to resurrect Yunichi. Even if Muzan comes, he can't stop me. I said it!"; Muzan: "You are really my living father."

Tomioka Giyu: "I want to be the most popular person [cold face]."

Muzan Kibutsuji: "The reward is a blue Higanbana?! As long as I can get it, I'll do anything~"

......

Is the plot difficult to accept?

Through questions and answers, all of them were changed to perfect endings!

(cp: After chapter 20, I will not promote the official version, only Komare and Snakereen)

Si Jinkun, who traveled to the Demon Slayer world, shouted at the beginning: I don’t want to be a human being anymore!

He went completely crazy after arriving in the world of Demon Slayer

That shadow that has lingered for a thousand years—Muzan Kibutsuji! That pitiful creature who cowers in fear because of the curse, that false king who vainly seeks immortality!

All his struggles and blood ghost arts became futile jokes in front of Si Jinkun's ultimate body that combined the curse of the stone ghost face and the essence of countless ghosts!

He treats Wuzan as a high-end bun

It also forced the demons and the Demon Slayer Corps to join forces for the only time in a hundred years.

Many years later, Si Jinkun, who had already become a JO-level creature, looked at the world he had ruined and fell into deep thought.

Travel through Demon Slayer and merge with Muzan Kibutsuji!

Reorganize the Twelve Demon Moons, run rampant in Tokyo Prefecture, and terrorize Japan!

End the Demon Slayer Corps, liquidate Ubuyashiki, and aim at Taisho Tenkō!

Strategy of thousands of ghosts, swallowing the world, only I am Yue Yan!

[Double male protagonists + no system + non-cool text + villain + both sharp and sweet]

P.S.: "Those with upright values, please watch with caution."

I woke up and found myself transformed into the villain Demon King Muzan Kibutsuji from the anime Demon Slayer?!

But now that things have come to this, in order to survive, Mo Yunchuan can only start to plan a way to save his life!

From now on, I will help anyone who has anything to do with the Demon Slayer Corps and try to win their favor. I must make sure my favorability goes to the hilt!! And I absolutely won't do anything stupid.

However, strange things also began to appear. Jiguo Yuanyi was resurrected and even wanted to get close to the Ghost King Mo Yunchuan. Why did he resurrect? This is a question.

Moreover, who is Kawano, who can transform between a cat and a human? Why did he appear? And why doesn't Mo Yunchuan remember him?

Then, why does this pair of bodies also have an unknown soul? Could it be that two souls simultaneously traveled through time into one body?

And...if being born is wrong, then will the choices we make also be wrong?

Why are there missing memories and extra memories in the brain? Why are there extra memories? And what will they become after they are reassembled?

What is sealed in the deepest part of his memory? Why doesn't he know? Why does he feel in danger?

Does the world really exist? Is it man-made? Can you accept it?

A mirror can reflect yourself, but is what is shown the real you?

Are you willing to destroy everything to achieve a goal?

What is good and what is evil? How can we distinguish and define them?

Are there perfect people in this world?

Lin Guang travels through the world of Demon Slayer and awakens the Super Treasure Chest System! In Demon Slayer, slaying demons unlocks treasure chests; defeating the navy and celestial dragons unlocks treasure chests; and defeating enemies unlocks treasure chests in Naruto. Thus, Lin Guang continues to unlock treasure chests, conquering the world!

[Spell Return + Twelve Talismans + Invincible Cool Text + Not a Saint]

Jiang Chenyan travels to the world of Jujutsu Kaisen and begins by activating the power of the twelve talismans. The Dog Talisman grants immortality! The Rabbit Talisman grants unparalleled speed! The Ox Talisman shatters all obstacles! Gojo Satoru: "I've never seen your technique before. It's very interesting." Jiang Chenyan wields the Dragon Talisman, and with a burst of flame, he blasts the special-grade cursed spirit into dust. When the twelve talismans are combined, even the curse king, Ryoumen Sukuna, will have to obey my orders!!!

Hiruzen Sarutobi: He is a demon, a despicable demon. Given enough money, he dares to trample on everything in the world.

Orochimaru: A respectable scholar whose thirst for knowledge and obsession far surpass my own.

Rasa: In his eyes, everything is a pawn. If necessary, he can put the entire ninja world on the chessboard.

Yekura: He always liked to hide everything behind his smile.

………………

Yusuke Hanasaka claims he was wronged; he only wanted to make the Hanasaka family great again. Who knows how he became a wicked capitalist in the ninja world, a shameful usurper, and the source of all the tragedies?

"No, I didn't, don't talk nonsense!" Hanasaka Yusuke retorted. "If you keep talking nonsense, believe me, I'll smash you with a Planetary Devastation!"

World Line: Naruto - Elden's Ring [Dark History, Can Be Skipped] - Naruto - Fate/Extella [In Progress]

[Fan Fiction] + [Quick Transmigration] + [Plot] + [No Female Lead]

"Brother Tongzi, I have a question?" asked the demon in an elegant Taoist robe.

"Speaking."

"This is Jackie Chan Adventures, right? Where is my talisman? And what do I look like now?"

"A spell? Isn't this the most basic thing? As for you, you are the great Moon Demon!"

Traveling across time and becoming the moon demon Zhulan, Zhou Lan began his legendary life.

[Note]: This book is a fan fiction, and contains extensive descriptions of the brotherhood and sisterhood between demons. It is a personal creation of the author, so please do not read if you do not like it.

Disclaimer: everything is based on the original plot.