One Piece: Became King of the World - Chapter 51: Owing a Favor

In the end of the era, the ghost wizard was killed in a car accident, the soul crossed, and he found himself in Japan, and he was attached to a Japanese.

I was thinking about taking a name in Japan, and I picked up a newspaper and glanced at it –

Kudo Shinichi, Sherlock Holmes of Japan’s Heisei, the savior of the police? In the trough, how does Laozi wear into the world of the second yuan? Well, all in all, this is a story of a wizard playing a passerby in the Conan world…

- Description from MTLNovel

In a world where humanity is defined by Classes, Classes are everything, and when you get a low rank class you're stuck with it until the very end. Axel awakened the supposedly lowest of the low rank class, he was mocked for it and ostracized but little did any one know, that this was only the humble beginning of a boy that could steal classes and evolve them. This strange Class that Axel awakened set him on a path to possibly becoming the strongest in all the dimensions.

In the grimy Black Hound Tavern, disgraced hunter Kael Veymar drowns his failures in ale, his father’s shattered crest a noose around his neck. When a Fallen beast attacks him—spewing acid and cryptic threats about the Harbinger—he’s saved by Lyria, a rogue huntress with a deadly smile and a glowing amulet: the Fractalis, stolen by Kael’s father.Their reunion is cut short by Dren, Kael’s former brother-in-arms, who slit Garrik’s throat for the Guild. After a vicious alley fight, Lyria helps Kael escape, but not before a Fallen’s ooze sears his flesh, leaving veins of corruption that **pulse with the Harbinger’s voice.Seeking answers, they flee to Ms. Miller, an old ally who gifts Kael a sword and a warning: “Find Torin. The skulls will whistle your name.” But the Guild is closing in. At Celestis Rise Dren is humiliated for his failure, while the Dozen Vanguards receive a bone-chilling letter—its author dead, its ink fresh.The stakes sharpen:- The Fractalis is not what it seems.- And Garrik Veymar’s shadow stretches long from the grave.Now, Kael and Lyria ride toward Godsgrave, where Hunter blades go to die—and where the Harbinger’s eclipse waits to rise.

The formless ancient world was infested with despicable demons. They hunted and feasted on mankind, keeping the human civilization constantly in a weak and suppressed state.

During the first known year, a magical mountain descended into the world from the realm of the Gods. Carved on this enormous mountain was a message: ‘Heaven Prevails’…

After the Grand Descent, a name that was given to the descending of the mountain, the Three Great Sages made their ways to Mystic Mountain where they learned to harvest what we now call magic, establishing the Mystic Cults and eighty-one sacred shrines to help aid mankind with the cult’s mystic powers against the eternal fight to the death with demons.

- Description from Novelupdates