Coming of the Villain Boss! - Chapter 1637

The unparalleled Demon King Ye Xuan, who was able to heal the death or the living alike and holder of the medicine Holy Scripture, was betrayed and killed by his fellow Demon Kings. But he reincarnated into the body of Ye Xuan, the prodigal son of the Ye family and vowed to himself that he would return to his peak and take back everything that belonged to him!

- Description from Novelupdates

“Kat, you have a tail” said Lily

“Look, Lily, it really isn’t that big of a concern” said Kat

“You.Have.A.TAIL KAT” said Lily “How is this not a concern to you?”

“Well, the dream I had was a bit weird as well, but if I’m honest, I’m mainly worried about the floating text that’s on fire” said Kat

“THE What?” said Lily

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Join Kat on her dimension hopping adventures as she fullfills her demonic duty and answers the call of the summoner. Each week Kat will get involved with new strange situations and oppurtunites that await her. During the week she'll have her best friend Lily, and perhaps a little help from Sylvie to figure out what's she supposed to do with her life now that she's becoming a demon.

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.