When a modern soul named Lin Mo awakens in despair, he discovers he has been transformed into Rengoku Hishin, the young adopted son of the Rengoku family, and finds himself in the world of Demon Slayer, where man-eating demons run rampant. Fate has bestowed upon him cruel trials, but also a unique gift: deep within his soul is the unbroken legacy of the legendary swordsman Kenshin Himura's "Hiten Miken-ryu" (Hiten Miken-ryu), along with a profound memory of the tragedy of the original story.

Holding the legacy in hand, yet burdened with regret, Fei Xin vowed: Never let those warm lights go out again! He combined the essence of Hiten Miken-ryu's "super speed" with the breathing techniques of the Demon Slayer Corps, forging his own path on the brink of life and death—**Fri no Breathing**! The crimson blade blazed like a meteor, piercing the darkness, imbued with the swiftness of thunder and the scorching heat of fire, and bearing the conviction to protect and not kill.

Starting from the arduous training in Narrow Mist Mountain, Fei Xin used the red blade in his hand to slash towards his predetermined tragic fate.

Thousands of years have passed, and the Invisible Empire has returned. But before them stand three insurmountable mountains. ——The invincible numerical monster, the super hybrid, the "All-Killing" Captain of the Thirteenth Division, Ichigo Kurosaki. ——The Touching and Inspirational Emperor, the Lord of the Soul King Palace, the "Dream Collapse" God King Aizen Sosuke. ——The veteran time traveler, the System's favorite son, the "Fighting God" Second Generation Captain Shinomiya Takashi. ... "...I see, a nightmare? What a good omen." "Your Majesty, what are you talking about?"

Villain Rule No. 1: Don’t provoke the protagonist’s group or any of those Children of Destiny. The farther away, the better!

Villain Rule No. 2: If you run into one of the protagonist’s harem girls—run!

They’re all cheat characters!

…Su Cheng transmigrated into a cultivation world. Not only was he unable to cultivate and had no cultivation base, he couldn’t even survive by lying low until the end!

A fox spirit who can hear inner thoughts!

A princess with a system!

And a Saintess who only wants to make babies!

They’re all cheats!

Everything’s out of control!

Now all these women want to become my disciples!

But they’re part of the protagonist’s harem!

I only founded a sect to live off the sect’s allowance!

I never wanted to take any disciples!