The Extra is a Genius!? - Chapter 111: The Request

A supreme expert in the Immortal World had died, and a strand of his soul returned to its original body on Earth. Tang Xiu discovered with amazement that ten thousand years passed in the Immortal World, yet only a single year passed on Earth.

Ruthlessly betrayed by his lover and trusted friends, Tang Xiu found that his soul went back to his previous body on Earth, and, despite he spent 10,000 years in the Immortal World, just a year has passed on Earth and many things have changed. Having an unsurpassed knowledge, Tang Xiu will protect his loved ones and go back to the Immortal World to take his revenge.

- Description from Novelupdates

A legendary powerhouse of his generation, tired of the bustle of the peak, returned to the ordinary city and started a new life as an ordinary teacher. He wrote the legend in the city.

Magnificent mountains and rivers, the rising powerful ones. Some ancient martial art masters stood at the peak, becoming legendary. Some financial crocodiles rose up in the minuscule places, laughing arrogantly.

However, watching the school beauties was better than fighting and killing; educating was better than fighting for fame.

- Description from Novelupdates

Liam, a socially awkward college student, spends his days immersed in anime, video games, and hentai, escaping the monotony of his real life. Despite his fantasies, he’s never experienced a real relationship or intimacy. But when he is mysteriously transported to the fantastical world of Eryndor, Liam’s life takes a dramatic turn.In Eryndor, Liam is hailed as the ‘Lustforged Hero’, a legendary figure destined to save the realm from the tyrannical sorcerer, Maltheris. But there’s a catch: in this world, power is drawn from desire and intimacy. To grow stronger and unlock his true potential, Liam must navigate a delicate balance between his newfound responsibilities and his own untapped desires.Joined by a group of fiercely loyal followers—each with their own unique abilities and personal struggles—Liam embarks on a journey to master his powers, unite the fractured kingdoms of Eryndor, and confront Maltheris. Along the way, he forms deep bonds with his companions, including the enigmatic warrior Lysandra, the cunning mage Erynn, and the rebellious rogue Selene. But as Liam’s power grows, so does the temptation to lose himself in the very desires that fuel his strength.

The story is about a a hitman, Who dies because of his own recklessness and transmigrates into a game he used to play after his retirement as a hitman.I'm not gonna spoil any further, but i might answer few of your questions.Is MC overpowered?Nope, he'll become strong over time and all battle he'll fight will be because of his effort and techniques.Is there magic and adventure?Yes! It have both magic like normal isekai with adventure and fighting with monsters and many other things. There are other important things like “Essence Stone” But let's talk about it in the chapters.There will be harem?Not really, He will be in contact with many beautiful female and males but one waifu but i haven't decided yet.All i can say is, give it a try, I'll try my best to make it worth your time.