As a time traveler from the Harry Potter universe, Vilan Costa always considered himself lucky. This was because in the timeline he traveled to, the infamous Voldemort had just reached the pinnacle of his power when he was assassinated by an unknown powerful wizard. He and Harry enrolled at Hogwarts at the same time, studying together in Gryffindor House. Harry lacked the lightning-shaped scar and the reputation of a savior, but he had both parents and a happy family. Vilan spent his first three years at Hogwarts uneventfully, until the summer vacation of his third year, when everything changed. His right eye developed a problem. After several days of unsuccessful treatment, it gained a unique ability—in short, it could accurately detect tiny marks on objects...

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.

A level 60 newbie was playing the online weekly dungeon, but he never expected to meet the big brother on the way.

I only heard one sentence from my elder brother:

"Damage explosion, lie down!"

Lin Feng's eyes went dark and he was sent to Teyvat.

He wanted to complain,

Looking at the level 999 treasure-stealing weasel beside him, he smiled heartily from the bottom of his heart.