Hero? I've Long Stopped Being One - Volume 1 Chapter 9

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.

There’s a legendary Bishoujo Game that has become popular among Japanese gentlemen.

Chen Han was a genius and hard-working boy. When he defeated a young master of a prominent family, he was attacked in retaliation. His dantian was shattered and he fell into Jianyuan. He was reshaped by a mysterious entity with the true spirit of his life, and he cultivated the techniques of the Peerless Heart and The Emperor.

With peerless mentality and supreme combat skills, he fought fiercely in the world, swept the six lower realms, and galloped across the three higher realms.

When countless treasures of heaven and earth, divine weapons and sharp weapons are in the bag, when countless beautiful women return to the harem, and when countless strong men are completely annihilated, this vast world would be under my feet!