Bloodline: Sovereign's Awakening - Chapter 54: Freedom Confederation: City of Alunsina II

Sano Yuji, a black company employee, is summoned to another world while finishing his work at home. His profession in the other world, a Monster Tamer, is considered a job that makes it difficult to become an adventurer. However, thanks to some slimes he met, which read several magical books, he gained magical powers and the second profession, Sage. Yuji acquired overwhelming power, but is he conscious of his strength? Blindly becoming unparalleled and strongest in the world!

“Each betrayal leaves a scar… and hers ran the deepest.”Once, Aveline Laurent gave her heart to Damien Ashford - the man who promised her a future, only to cage her with sweet lies.She endured it all with a smile… until fate dragged her back to the very beginning.Now, with a second chance hanging by a fragile thread, Aveline returns.Not to plead, but to punish.
Not to forget, but to make him remember.But revenge is never simple. The path is fraught with shadows—and an unlikely ally–Alaric Lancaster–whose loyalties remain as mysterious as his gaze.

After getting shot, Lucas, a serial killer, reincarnated into the novel world as a tragic villain with the same name, Lucas Ciffer.

Lucas Ciffer was supposed to be the Holy Kingdom's successor to the throne, but his demonic appearance and the powers he possessed terrified the entire kingdom. A white-haired boy with red eyes and pale skin, together with his dark powers, got persecuted and exiled by his own family. Not to mention that in the future he was destined to die by the hand of the hero.

Lucas fell from holiness, and, with the serial killer's bloodlust and knowledge of the future, he decided to prove the world right.

Yes. I could be a villain; no, in fact, I WILL BE THE VILLAIN.

A broken man who ended his own life finds himself reincarnated into the game he used to play. However, instead of becoming the protagonist or a powerful antagonist, fate places him in the role of a minor villain—a mere stepping stone for the protagonist in the game's first arc.