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!

Qin Tian obtained the Master of All Techniques system, which allowed him to impart special skills and cultivate those who "only knew how to use my own techniques". He then personally guided his daughter in practicing the flying knife technique.

"You are uneducated and incompetent! You have no way of educating your children!"

"Instead of educating his daughters to study hard, he's actually taking them to practice with hidden weapons? He must have read too many novels!"

Unexpectedly, the exercise video was accidentally exposed, which attracted criticism from the entire Internet. Even his ex-wife blamed him, but Qin Tian still did his own thing.

It wasn't until a short while later that a call to the police shocked the entire Internet.

"Hey, Yaoyaoling?"

"Police officer, I've encountered human traffickers. Can you come and save me?"

The police rushed to the scene, but when they arrived they saw that several human traffickers had already fallen to the ground and died. Their fatal injuries were caused by multiple flying knives and daggers, each of which was fatal!

Shocked, the police hurriedly took the child to find his parents, but they saw an even more shocking scene at home:

The eldest daughter was practicing swordplay, splitting rocks with one blow.

The second daughter practiced martial arts and crossed the river on a reed.

Their father is writing down the unique skills and teaching them personally...