MTL - Sweet Wife, Pampered Fast - Chapter 5 Under legal age

He is a young man without a spirit root. It is believed that this denies him the chance at cultivation. However, a mysterious lady imparts a Supreme Demon Classic to him and from then on, he starts his path of cultivation.
He undergoes a total transformation to emerge as the most fearsome and powerful fiendish demon in his era, that even immortals and fiends are fearful of him, and saints are at his beck and call.
Mastering the Supreme Demon Classic is the turning point in his life. He is able to unleash his immense and divine power from within, illuminating the entire universe!

- Description from Novelupdates

[ WARNING! MATURE CONTENT R+18 ]Synopsis:In the thousands of years of buried and recorded history, the mighty Godents—humans who arbitrarily gained extraordinary powers through a mysterious celestial body known as the Goddess—reigned supreme.After seemingly countless debates and wars of all kinds on how to maximize the utilization of the omnipotent comet that landed on Earth, the Summit Academy was thoroughly built.An academy with unique students whose words were infinitely more absolute than a mere third-world country's government...An academy where human depravity was constantly challenged and displayed against the nature of goodness...In this grand society that was founded for the sake of superficial peace and schemes in the shadows, a certain piece of information reached those in power.“The M-Rev File was lost.”A mysterious document allegedly containing critical information about the Goddess...Now presumed to be at the hands of an heir of one of the Seven World Corporations... and at the same time, a royal student in the very prestigious academy.Amidst the echoes of malice, one mercenary who appeared out of nowhere and with the questionable mission of protecting this female student was admitted.Student Name: Aeon ???Additional Information: ???However, all things considered, on Aeon's first day in this school that could decide a person's future in the blink of an eye, he received a peculiar text message—/ I miss you... /A/N: This R+18 story isn't something just to satisfy the reader's lustful nature...

Xu Jun finally defeated the BOSS–the Dark Demon King, in this stand-alone, virtual reality game. When he wanted to go out to browse Weibo and express his mood, he suddenly encountered a game BUG and immediately passes over to the game world.

He became the man who finally took down the Great Demon King in this world. Gratifying! The attention of millions of people!

……However, he did not know the development of this world was not the same as the game, the Demon King did not die, rather his soul entered into Xu Jun’s body; this Demon King knows of all the stupid things Xu Jun does everyday…….

- Description from Novelupdates

Reborn into the world of Yugioh, it's natural if my goal is to become the best duelist!