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?

[Shuangwen, decisive in killing, no saint, no disciples, no stud]

Once you travel through time, you come to a world of cannibalism where demons and monsters are rampant.

In order to avoid starvation, Daoxuanyi inherited a dilapidated Taoist temple and embarked on the path of slaying demons and eliminating evil.

……

"Little Taoist priest, your cultivation level is not up to par!"

A ghost king, whose grudges were so great that he had painted the sky black, looked at the slightly immature Dao Xuanyi and smiled with disdainful eyes.

This Taoist priest is really good!

I don't know where he got the courage from to challenge this thousand-year-old ghost king.

Daoxuan smiled when he heard this.

He took off his shirt, revealing his muscular upper body.

Then……

As everyone looked as if they had seen a ghost, the Ghost King was actually blown to pieces by a single punch.

"Is Xuanmen cultivation not good enough?"

"It's okay, I know a little bit about fighting too!"

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!

A boy named Uchiha Mei lost his parents to demons when he was ten years old. He met the Flame Pillar, Rengoku Makijuro, and became his disciple, possessing extraordinary talent. He formed a bond with the Flower Pillar, Kocho Kanae, becoming Tanjiro's teacher. He arrived in time to fight Child Demon when Kanae was attacked. He instinctively killed Child Demon, but Kanae was seriously injured. To ensure Kanae's safety, he inadvertently allowed Child Demon to escape. He later became the Fiend Pillar.

A young man from the modern era travels to the Demon Slayer world and becomes the descendant of Tsugakuin Yoriichi – Tsugakuin Najo. The protagonist is born with markings and natural transparency. There are two female protagonists (guess who they are): Muzan: "Don't come over here!" Kokushibo: "Come on, you will finish Yoriichi's unfinished duel!" Sango: "The ultimate battle!" (Slightly altered plot) (This book is not a cool novel; just having markings and transparency doesn't mean you can easily kill an Upper Rank! It's a coming-of-age novel.)

(Pseudo-invincible + female lead Shinobu Kocho + system runs away at the start) Shimotsuki Mirai transmigrated to the present day and has spent her childhood wandering around the forges of the sword-forging village, the clanging of hammers the lullaby of her life. The blacksmiths always said this child's eyes were too still, as still as a quenched blade, unaware that the vermilion burn marks on his palms, shrouded in years of wear, concealed an astonishing power no less than that of a Nichirin Blade. When he first met Shinobu Kocho, he only felt a stinging pain in his eyes. Before seeing the girl, all his information about her came from the precious little black box he couldn't bear to part with in his previous life, but now, the person from his dreams stood before him, more vivid than any description. The girl blushed, staring at the light dancing on his fingertips, asking if he was a deity descended to earth. Kanae leaned against the door, chuckling softly, "Such a wondrous boy is hidden in the sword-forging village." Looking into the clarity in the girl's eyes, Shimotsuki Mirai suddenly wanted the sword in his hand to protect that light a little longer, just a little longer...

Evil spirit + joins Muzan + eats people + no system.

(The protagonist is very bad! Very bad! No humanity, please don't mind if you accidentally enter!)

Manami, who depended on his younger brother for survival, joined the Demon Slayer Corps and became the disciple of Yoriichi Tsugukuni, the most powerful member of the Demon Slayer Corps. However, he failed to kill Muzan during an encounter with him, and thus became a sinner of the Demon Slayer Corps. He was expelled from the Demon Slayer Corps along with his master Yoriichi Tsugukuni.

When he met Muzan again, he had two choices: become a demon and make those who hurt him pay the price, or continue to live like garbage.

Wan Mi chose the former.

Since you have expelled me, I will live my life in the most horrible way possible!

If the Demon Slayer Corps can't tolerate me, then I will become an evil demon!

[Health Bar][Warrior of Chaos][Comprehension][Decisive Killing]

Are you good at fighting? What’s the use of being able to fight? The most important thing when you are out there is to have a lot of blood. My blood volume is a hundred times that of yours!

…

Traveling back to the Great Yin Dynasty, the emperor was skinned by demons, the demons devoured people, and the people suffered.

Awakening panel:

HP: Killing people can increase the upper limit

Comprehension: HP can be converted into comprehension

Mastering Martial Arts:

[Wild Wind Blade] Comprehend - [Wild Wind Breath Slash]

[Crazy Demon Stick Technique] Comprehend - [Demon-Subduing Vajra Indestructible Stick Technique]

【Iron Shirt】Comprehension-【Great Sun Immortal Divine Body】

If you don’t have enough understanding, then kill, kill, kill!

Panel, with my lifelong talent, let me see your limits and give me understanding!

Maoshan secret techniques, Buddhist Vajra, Heavenly Master Taoism, and all kinds of extraordinary powers are not as powerful as my sword!