MTL - I Copy Under One Punch - Chapter 108 Aomori's debut (subscription required)

Satou Shiki a Japan present-day university student suddenly one day he got attacked by a slasher when he open his eyes he was already transferred to another world’s labyrinth city. In that another world he who was awakened to do a lot of “things”.

After his death, Aoi Hiroto is reincarnated as a beast-like race, similar to Ghislaine's race, but with the memories of his past life intact. Now, torn between his animal instincts and human rationality, he tries to find his place in this new world. While Rudeus continues his journey, the protagonist forms new connections and learns more about this new world.Warnings:- The MC is like Rudeus, he doesn't know the world of Mushoku Tensei, for him, this is a new world with magic and swords, but he has seen other known animes.- Rudeus will still exist in this timeline, but the chapters that will show his point of view will be very rare, unless he is interacting with the MC.-The confirmed members of the harem so far is only Ghislaine.I do not own the cover image or any characters or references taken from the work Mushoku Tensei.English is not my first language, but I will try my best not to make mistakes.

In novels with a stud there is always a Senior Martial Brother like this:

In the early stages of the novel, his innate talent is high, his cultivation is good, his appearance is handsome, and he has an intelligent, cute younger Martial Sister as a fiancée.

In the middle stages of the novel, he is caught unprepared and defeated by a young disciple (the protagonist) in the sect who’s hardly remarkable at all. From then on, he falls from his godly altar and loses his brilliance. Even his young Martial Sister leaves him for someone else.

In the late stages of the novel, he continues to turn dark, going down the Demonic Path and becoming the major villainous boss. However, the protagonist still ruthlessly defeats him and his soul is eternally sealed.

Once Qin Mo opened his eyes, he discovered that he had become this Senior Martial Brother.

- Description from Novelupdates

Jiang Bai woke up one day and found with shock that he had transmigrated to a parallel world that is similar to Earth. There, he was granted a cheat system to help him forge the path of a tyrant in this new world. He was now stuck in this parallel world body, the body of a weak and cowardly person. Join Jiang Bai as he rose to the top in this new world!

- Description from Novelupdates