Mitou Shoukan://Blood-Sign - Volume 3, Battle Tutorial

Lin En transmigrated into a magical world that resembled medieval Europe but had the power of magic.Here, magic could affect and control basic particles, which was based on scientific theories that served as magic formulas!The wizards, who were actually scientists, were struggling to explore the truth of the world under the chase and blockade of the church. Lin En’s arrival sparked a renaissance of the alternate world…The white phosphorus fire, known as the Flame of Hell, the liquid nitrogen field of extreme cold, and the resonance frequency that kills without a trace… A few years later, the Holy See gathered all countries to the city, known as the legendary wizard, the pioneer of magic Lynn under the gaze of a group of wizards, wrote down the mass energy equation known as the ladder of God by later generations! Lynn looked around the crowd and said nonchalantly. “Mass and energy are interchangeable, and based on this theory, I have developed a powerful forbidden curse… It’s called — “The Big Nuke!”We will re-examine the world from the perspective of magic, where science is magic, and magic is science!

Crossing to One Piece world, he became Roger’s younger brother.

Unexpectedly, Gol-D-Roger who was in his fifties had a teenage brother. But he was so weak.

Fortunately, at the age of sixteen, he actually found himself with a possession soul system.

He had attached to the master IP man, also to the White Phoenix and to Ge Nie with his strong ability of the Hundred Step Flying Sword.

If you think that he can only Purchase these? Then you’re wrong!

Pain, Itachi, Ichigo Kurosaki, as long as there is money, any soul can be Purchased.

- Description from Novelupdates

Chen Rui, an otaku from earth, is reborn into a human body in another world, who falls into the legendary evil, brutal world of the devil called Mozu where humans are treated as food. He has to survive while facing horrors of the devil, violent dragons and a variety of powerful enemies by depending on a strange super system chip and his wits. Surrounded by Devil’s beauties such as black-bellied lolita princess, cold queens, violent dragons, charming poisonous devils …

Wanting to live in the Devil’s world is hard! Wanting to live in the Devil’s world as a human is harder! Wanting a human to be the devil’s son-in-law is hardest!

Let us see how a small otaku uses power and strategy step by step starting from an ordinary human to writing a legend as the devil’s greatest son-in-law.

Julian, the son of Duke Alden and the grandson of Grand Duke Augustus stood Infront of the crystalline ball that emanated mana.The crystal absorbed his mana and started glowing with purplish hue, with a sparks of lightning.“Yes, I have unlocked Lightning Affinity,” Julian said, a spark of excitement lighting up his blue eyes.Suddenly, the ball began absorbing too much mana, Julian's eyes widened in horror as the energy swirled out of control, crackling with an intensity that was and terrifying. Just as he realized the danger, the ball erupted in a blinding flash, a shockwave of power surging outward.Julian wasn't hurt, but he felt a strange sensation as a dark mist swirled in front of him. Suddenly, he saw a strange entity, a shadowy figure, slip into his forehead.Then, Julian heard an unfamiliar sound echo in his head:“WELCOME TO THE MILF SYSTEM.”Connecting....SuccessInitializing.......Success“FUCK THE MILFS AND GET STRONGER, CONQUER THE MILFS, CONQUER THE WORLD.” , The voice saidCuriosity piqued, Julian quickly asked, “Can you tell me more about the MILF SYSTEM?”The voice continued, ”Sure, The MILF SYSTEM will help you reach unimaginable power as a mage. You will need to complete the tasks assigned to you and earn points.“