This Japanese Monogatari Isn't Lame - Chapter 613 - 382. Getting Married on the Spot, Please (4000 words)_2

A genius inventor dies and awakens in his younger self's body... but not quite. This isn't his original younger self-it's an alternate version from a reality where the supernatural is real.To make matters even more chaotic, he discovers that someone has decided he is the successor to Solomon. Now, he possesses the power to enslave devils. Armed with his intellect and newfound abilities, it's time to spark a worldwide revolution... starting from his garage!---Tags: Neutral-Evil MC (enslavement, selfish MC), Harem (of course), Inventions, Technological Progress, Sacred Gear Creation, AU DxD Universe (part of Dragon's Omniverse).This fanfic is a STEAMROLLER, with the main focus on the MC's development and his technological innovations, as well as their impact on the world. If you're looking for drama, suspense, or epic battles with no real purpose, this isn't the story for you.

What happens when a scientist from a futuristic world reincarnates in a World of Magic and Knights? An awesome MC is what happens! A scientist’s goal is to explore the secrets of the universe, and this is exactly what Leylin sets out to do when he is reincarnated. Dark, cold and calculating, he makes use of all his resources as he sets off on his adventures to meet his goal. Face? Who needs that… Hmmm… that guy seems too powerful for me to take on now… I better keep a low profile for now. You want me to help you? Sure… but what benefit can I get out of it? Nothing? Bye. Hmmm… that guy looks like he might cause me problems in the future. Should I let him off for now and let him grow into someone that can threaten me….. Nahhh. *kill*-

Alternative: Leylin is transported from an advanced technological era into a medieval world— except there’s magic. Equipped with “only” his quick wits and an A.I. chip fused to his soul, he sets out to become the most powerful magus the world has ever known. In a land divided into the Light and Dark Magi, the weak can either be cattle or disposable slaves. Only the strong can determine their lives, and only they have the luxury for virtue. Yet strength is only a tool for Leylin, like any other. His goal, in the end, is his own.

A former sporting rifle shooter genius transforms into the ‘Juvenile Butcher’. While originally supposed to have received the death penalty, he was instead fortunate enough to have entered a secret and highly regarded armed force, throwing himself into the ‘Nirvana Project’.

After a period of 10 years, he now has time to freely recover. Having trained until he had excellent military and martial skill, he sweeps through various military districts and returns back to his hometown. Under the monitoring of a beautiful female cop, he re-establishes his family’s bodyguard service, protecting beauties and moving unhindered, his achievements causing the fame of his outstanding, god-level bodyguard service to resound across the world!

- Description from Novelupdates

Traveling through the world of pirates, Shane fell from the sky and knocked out Shiki, the golden lion who was patrolling the floating island.

With a dazed expression, the large beasts on the island heard the sound and opened their bloody mouths one by one.

Fortunately, the system was awakened, and at the beginning of the game, he obtained the full-level overlord and domineering.

Xia En was full of firepower, stunned millions of beasts, awakened the golden lion, and vowed to accept Xia En as a disciple.

Since then, this sea has completely fallen into rampage because of his appearance.

“The indescribable monster born under the Golden Lion Gate appeared in the sea!”

“The evil generation Shane established an evil pirate group.”

“The despicable and shameless pirate Shane begins his bloody journey.”

“The emperor-like Shane led his kings across the great route.”

“The great Lord Shane has arrived at his faithful holy place, Mary Joa.”

“His Majesty Shane, the unparalleled nobility, delivered a fatal blow to the dictator of the World Government.”

…

On the Red Earth Continent Pan Ancient City, Xia En stepped on the Void Throne and looked down at many sea powerhouses.

“I come, I see, I conquer!”

- Description from novelbuddy