Beastmastering: The Best Master Ever! - Chapter 1: My World Has Changed

An underprivileged prodigy, a cruel, ruthless world, and an epic story of battle and conquest. A young man with an exceptional inheritance leaves the small, rural city from which he hails on a journey to find the girl of his dreams. He defeats countless prodigies, sweeps through all forces that dare to stand in his way, and progresses step by step toward the pinnacle of all the worlds!
“I’m not targeting any gods in particular. All I’m trying to say is that all gods are trash in my eyes!”

- Description from Novelupdates

The psychedelic forest was encompassed in a thick cloud of fog, barring the vision of everyone, while behind those thick fog ruled chaos, as countless ferocious creatures fought valiantly.Some distance away, under a muddy patch of grass, a unique little creature stuck her head out from the dark insect egg.“Oh, what the hell is this?”‘Why am I born among this terrifying pile of insects?’The area was densely packed with eggs. Occasionally, one or two fat insects would crawl out from them. They looked scary and hideous.“I think I was playing a game a few moments ago, right? Why did I appear in such a place and become a monster girl?”

When 16-year-old Kyle Conner arrives at his aunt's for a holiday, he expects relaxation and freedom. Instead, his life is forever altered when he crosses paths with Lilith, the demon of lust and second-most powerful entity in the underworld.Forced into a dark pact, Kyle is transformed into a demon and gifted with a mysterious system that promises immense power. But this newfound strength comes with a deadly price: Kyle must hide his true nature and navigate the treacherous world of demons, all while being hunted by Lucifer and other malevolent forces.As Kyle struggles to control his newfound powers and unravel the secrets of the system, he discovers his ultimate goal: to overthrow Lucifer and bring about a new era of peace. But with the forces of darkness closing in, Kyle must confront the darkness within himself and make impossible choices to survive.Will Kyle be able to master his demonic powers, outwit his enemies, and fulfill his destiny? Or will the weight of his newfound responsibilities consume him, dooming humanity to eternal darkness?Note: this is a really interesting novel containing r-18 scenes, weaktostrong, overpowered, demons, systems, anti-hero...

Our protagonist Caam is a man from Earth that was reincarnated into this world as a demon. In order to survive, he spared no effort in avoiding the sparks of battle and without noticing it, he became strong himself.