Death March kara Hajimaru Isekai Kyusoukyoku (WN) - 18-32. Boy in the Labyrinth City (5)

Kai had always been into fantasy stories—knights, mages, epic battles, and especially the whole “hero vs. demon king” thing. But out of all the crazy tropes those stories had, the one that always stuck with him the most was hypnosis.Then one day, while walking out of a store, fate hit him like a truck—literally. He shoved a woman out of the way, saved her life… and promptly died. Classic.But instead of fading into the void or getting some sad funeral scene, Kai got the “Congratulations, you’re reincarnated!” treatment. New world, new rules, new him. Total fantasy package.He was told he could pick three abilities to help him get started. So what did he choose? Strength? Magic? Swordsmanship? Nah. Kai picked hypnosis. Because why not have a little fun with mind control in a world where dragons and demon kings exist?Now, with his powers unlocked, Kai’s ready to dive into an adventure full of excitement, danger, and a little (okay, a lot) of debauchery. And hey—if he ends up saving the world while he's at it? Even better. All thanks to hypnosis, of course.*DISCLAIMER*This novel will be a fun adventure story, not to be taken seriously. If you just want to laugh, have fun, enjoy a super overpowered MC, and lots of lemons (maybe), then this story is for you. If you're here for an intricate, thought-out, crazy foreshadowing story with stakes, then this story ISN'T for you, so shoo, go away!

Have you ever thought a monster that has a job of a summoner and a tamer

what should it call itself Monster Summoner? Monster Tamer? but he itself was a monster too

Watch as our mc travels the world as an reincarnated human who turn into a monster

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