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!

Let's take a look at the Demon Slayer fanfiction

Ashina, the land of reeds, half-knelt on the ground, looking at Kuro who was unconscious in front of him.

......

"Please live on as a human being."

He swung the immortal sword "Bai Lei" on his neck, and the blood that should have splashed out turned into flying cherry blossoms floating on the reeds.

——————

During the Taisho period, in the alleys of a remote town, a lifeless body glowed with a pink divine light.

"resurrection"

A lifeless, thin figure sat up from the rain.

"Where is this..."

At this point, the Son of God and his Ninja Wolf, although in two different worlds, are both reborn at this moment!

Invincible + Not a Virgin + Ninja Beauty + Anime

He traveled through Naruto, replaced Senju Nawaki as Tsunade's (pseudo) younger brother, became the number one young master in Konoha in one step, and obtained the Dimensional Treasure Box System.

"Ding! Congratulations to the host for obtaining the Rinnegan (enhanced version)."

"Ding! Congratulations to the host for obtaining the Zanpakuto - Kyoka Suigetsu."

"Ding! Congratulations to the host for obtaining the Space Gem."

………

Possessing so many incredible skills at the beginning, Ling Yu said that it would be his turn to rule the entire ninja world.

Kick all the top movie stars, embrace all the beauties, and make up for the regrets in your heart.

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!

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!

The second time he traveled through time, he actually came to the world of Naruto and traveled through time to become the eldest daughter of the Hyuga family, Hinata Hyuga!

Feeling the weak spiritual energy in this world, which they called chakra, Hyuga Hinata sighed and decided to just choose to cultivate...

Traveling through Naruto and becoming a civilian orphan,

How can you survive in the war-torn ninja world?

No golden fingers, no bloodline limits, no family resources.

How can we dance in this chaotic world?

…

"Of all those who have fought me, you are undoubtedly the strongest, even stronger than Hashirama! Come on, young man! Dance to your heart's content!"

"Dancing? I'll blow your head off!"

Travel through the world of Naruto and start the awakening system!

Yo, host with a kind nature!

As a normal man, how could you watch that bastard Uchiha Fugaku eat young grass?

[1: Confess your love to Uchiha Mikoto and win her heart; Reward: One S-rank Ninjutsu (random)]

[Two: Kind-hearted host! Only fools would choose to forcibly steal First Blood; Reward: Sharingan and Three-Gate Ninjutsu proficiency increased by one level (immediately)]

Looking at the innocent expressions of his subordinates in the distance, Fujiwara Tetsuya fell into deep thought as he looked at his reflection in the water.

Do I want this blood or not?

The world of mutual understanding is the most ridiculous.

The peace of infinite dreams is the most hypocritical.

Darkness, cold-bloodedness and cruelty are the truest portrayal of this world!

So, you wanna dance too!?