I created my own system - Chapter 240 Gravity

Shiro Sakamaki was reborn into a new world with one simple goal: to live a peaceful, luxurious life free from drama.But when he transfers to a prestigious high school in Tokyo, he quickly discovers that his new reality is anything but ordinary. The city is a strange mix of supernatural forces, ghostly phenomena, and events that feel like they’ve jumped straight out of an anime.Before long, bizarre occurrences follow him everywhere, along with a series of beautiful, mysterious girls—from the arrogant, blonde twin-tailed exorcist, to the mysterious quintuplet sisters, to a passerby heroine with hidden powers.As Shiro gets tangled in the supernatural chaos, he realizes he’s at the center of something far darker. Cursed relics begin to surface, and Ancient, Evil Outer Gods—whose very presence bends reality—start to stir.Now, Shiro must figure out why he’s caught in this web of strange occurrences while trying to survive school and the surreal new world he’s been thrust into.

The little handsome son-in-law passed through a world as waste material and the husband of a wealthy family. But because of his lacking aptitude, the wealthy family had driven him out. So he worked hard and found a more powerful family’s thighs to hold onto. Soon enough, he became the strongest son-in-law and husband in history.

In this world, it was impossible to practice martial arts. It was futile so he might as well take advantage of his wife’s thighs and maintain a comfortable and leisure lifestyle.

He’ll train his wife to become the strongest and best person in the world.

“Whoever dares to provoke me, let my wife kill you!”

- Description from Novelupdates

The Old Gods are gone. Lost and Forgotten, their honor shattered and their kingdoms broken by treachery.The Peace of the Myriad Heavens has been severed. And from the ashes of war and chaos, the Twin Towers of Babel have been created as a beacon of hope.Can Altair, a child born of the Old Gods whose name has long since been forgotten, survive, or will he be cast into the Nine Hells?***“So...” Arsene continued, enjoying his child's flush expression. “I've got a few things to teach you. What I'm about to give you is some peak wisdom. Think of it as my Ten Commandments: One, never trust a bitch with red hair. Trust me on this. Two, the pull-out game is not a real thing. She will get pregnant. Three—”“F-Father…”“ —Never get yourself more than one wife. It sounds fun. It is fun. But it's truly a nightmare. You better be writing this stuff down. This is some grade-A wisdom right here. Four.“...Please stop talking…” The Prince pleaded.“Shhhhh. Just let this happen. Four…Bro's before hoes isn't a thing. The hoes come first. Remember, Booty is more important than Wa— ”“STOP!!!!!”

“In order to survive the future great war, we must take drastic measures. We need to summon warriors and train them before time runs out.”Thus, millions of earthlings were reincarnated in an alien, medieval world governed by swords and magic to save its prophesied doom.Among those individuals, one's situation inexplicably deviated from the others.Thrust into a rotting house in a ghostly body, Adam found himself bound to a wailing baby. With a heavily damaged soul and the snarky remarks of a system, he began his years-long quest to recover his body.Armed with his mind, he'll educate the baby and slowly watch him turn into a good youth. However, he would have to make a choice: suffer as a ghost until he finds an alternative that might not exist, or possess his body and reincarnate.He was far from imagining how dangerous this world full of possibilities could be, prompting him to question everything he knew... Including himself and this world's intentionally blurred history.