The Void Wolf - Chapter 132: Remnants Of The Past

When an S-class elite assassin-raised captain of a special ops suicide squad comes home from a high-stakes Africa mission, he finds himself offered something that could potentially set him up for life- a curious assignment that he could use to finally exit his days of war and slaughter.

Then placed into a high-school setting, Lin Yi is tasked by the chairman of a top-tier multi-billion company with bodyguard duty for non-other than his own daughter, a certain little Miss of said high-school.

His enemies, once ranging from drug lords, mafia bosses, political figures, and national leaders, are soon replaced with spoiled kids who happen to have rich papas and mamas, and Lin Yi finds his intense expertise and high-threat skillset misused, and very underwhelmed…

But he does get a harem cast as diverse as his old enemies, so Lin Yi decides that, for the sake of messing around with girls as an invincible entity in a down-leveled environment, leaving his bloody and death-filled war days behind is something he’d definitely want to strive for.

- Description from Novelupdates

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

Yo, Hi! I’m Frank, I made a deal with a demon to pay me some money for receiving a guest for a few days every week.
I had no idea about what I have done.
On May 1st, Conan ‘the God of Death’ came to my house. I was forced to let him in and we get involved in a criminal case.
On May 8th, Bruce Wayne ‘Batman’ came to me. I was forced to follow him to fight crime.
On May 16th, Hannibal Lecter, The Silence of the Lambs, came to my home. I can only say that I really can’t stand my guests.

- Description from Novelupdates

This is the story of a man who grew up with everything—money, love, family, status—but in isolation for being unique, abnormal... an anomaly.He finally gets a chance to show his skills, his talents, his potential to the world.On that fateful day, during his Awakening ceremony, not only did he awaken his abnormally strong innate ability, but he also found out he was being rewarded, loved, favored by the system.This is the story of a man who is undefeated by anyone and anything, a man who grew powerful beyond imagination, a man who rose to power on his own.This is the story of a man who turned many worlds upside down, stopped many wars, won many battles, dethroned kings, and became kings of many.This is the story of a man who represents both balance and imbalance, holy and unholy, good and bad, light and dark, pure and impure, positive and negative, order and chaos.It all started when the system started favoring him.Watch Sam grow from an ordinary noble to the most powerful entity in the entire universe while he finds many buried secrets about his origins, about the system that governs every being in the universe, and why he is being favored by the very system.There was none like him, and there never will be.