I'm an Infinite Regressor, But I've Got Stories to Tell - Chapter 243

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

The Bootlicking Antagonist Wants to Survive, but Female Lead refuses to follow the plotOne car accident and I’m transported into a city power fantasy as the villain. As long as I survive until the grand finale, I can return to the real world with hefty rewards. But! These stunning beauties don’t go to serve as the protagonist’s harem, they surround me every day. Are they not satisfied with how slowly I’m dying? Stop wearing stockings, stop wearing uniforms, what’s with all of you trying to seduce me? To find Long Aotian! Since destiny is in my hands, I might as well challenge the protagonist directly! Who’s the protagonist, damn it, who knows!

Lyle Walt is a young noble boy and heir looking forward to the day he can inherit his family’s territory. Except around when he was 10 year old, his parents started neglecting him more and more in favour of his little sister, Celes.
On his fifteenth birthday, he is challenged to a duel by his sister to see who will inherit the household and horribly loses, being cast out of his family. Afterwards, he gets treated by the family groundskeepers and receives the family heirloom Gem from him that Lyle’s grandfather had entrusted to him. From there, he begins an aimless journey with his childhood friend and former fiancée, Novem, and the Gem-turned-Jewel that houses the memories, personalities, and Skills of seven of his ancestors.

A tale of an ordinary senior high school student who becomes a legend by dispensing plagues and controlling vicious virus insects.