One Piece: Fist of the World - Chapter 20: The Righteous Navy Passing By

She roused from a pool of blood, vowing to exact retribution on those who had harmed her.

I’m a policeman, we took over the crime scene, and all the idlers and other people flashed!

Are you a detective? Do you have a formal license? Is it part of the police system? May I list you as a suspect?

Detective? Sorry didn’t hear it.

You want to reason? I’m sorry I’m not interested, but I’m standing there watching us handle the case!

Hey! Don’t move around at the crime scene, it’s you, that kid over there!

——New scum, listen to the teaching

- Description from novelbuddy

In the foreign world, the martial artists dominate the world and the sword of the emperor controls the fate of hundreds of millions of lives! Long Yu, the number one killer on Earth, after dying, takes rebirth in this new world in an aristocratic family of martial artists but faces rejection because he is unable to practice martial arts.

An ultimate warrior, the one and only Alchemy Emperor, Ling Han, died in his quest to achieve godhood. Ten thousands years later, he, with the ‘Invincible Heaven Scroll’, was reborn in the body of a young man with the same name. From then on, winds and clouds moved as he set himself against the uncountable geniuses of this new era. His path of becoming a legend has begun once more. Of all eras underneath the heavens, I am the strongest!

- Description from Novelupdates