Kill the Immortal with One Sword

First time writing a novel! Sorry, I am an otaku who often reads novels, so I want to try writing. If it is good, I will try to write it as fast as possible and write a novel for the general public. This article is already at an invincible start and the rhythm will be very fast. Try to skip as little as possible while reading, and there will be less introduction to the author. To be honest, I don't know what to rewrite. I hope you can forgive me. This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.