MTL - Yu-Gi-Oh!: Underworld Boss, Cancerous Creator God - Chapter 300

I fell into a game world out of nowhere with an instant kill skill.
And then somehow, I became a bigshot.

In the back of the forest lives Allen, the antisocial wizard. He is feared by the people around him and called the “Demon Lord”.One day, while living out his life as a hermit, he finds a young girl named Charlotte who collapsed. Although innocent, she was accused of evil wrongdoings, had her engagement broken and was forced to flee her country.Upon hearing that, Allen recalled the bitter experience of being betrayed by a party he once believed to be his companions. Hearing the story of the 17 year old’s exploitation, Allen decides, “I’ll let her live in my mansion, and I’ll teach her all sorts of bad things…”

This book is about how a famous web writer who specializes in doting genre falls in love with a Mr. cellophane writer who specializes in angst genre.

- Description from Novelupdates

[Warning: R-18]Lukas had just started making his career in a good company, allowing his family to live comfortably, when he was poisoned by some of his jealous colleges during his promotion-celebration dinner.Everything blanked out in front of his eyes and he thought he was dead.Miraculously, however, he regained his senses but he was no longer the Lukas Adams, the rising star of his company--he was now Lukas Rivervale, the youngest son of Viscount Raymond.Clearly, he had transmigrated.After accepting his new reality, he realized the world he was in was a Magic World, dominated by Mages.In this world, only strong were respected and because he had failed his awakening ceremony at the age of 12, he was despised and looked down up.What a tragedy!Fortunately, the Goddess of Luck seemed to be smiling upon him because he realized he now possessed the Legacy of an Arcane Mage, one the strongest beings to ever live in this world.Vowing to become the strong enough to find a way back to the Earth and take revenge on those who plotted against him, he embarks on the path of a Mage.