You don't want your secret to be revealed by others, right? - Chapter 193 - 17, Sword Skill 2

One day every human on the world suddenly receives a mail claiming to enact the World Salvation Project. Half in doubt Kurosaki Shion, a diligent university student and loner, follows the mail’s instructions, becoming one of a million Demon Kings governing his very own Domain in the new world.

*** This is a post-apocalyptic story containing many fantasy elements. It is a somewhat dark tale following Shion as he grows while aiming for the unification of the all too sudden new world. It has many game-elements bolstered by strategical thinking while at the same time providing funny moments and romantic encounters.

“I hope you don’t fall in love with me, because I won’t be taking responsibility,” warned the young man. “Don’t worry, I won’t fall in love with a body double,” the employer dully replied. Yet, both of them forgot what they had said.

Ji Huan’s parents both died in a traffic accident.
Unexpectedly, his older sister also meets the same fate.
Yet everything starts when he says “goodbye” for the last time.

Hunting monsters? Genetic comparison?
Ji Huan flees with his older sister’s posthumous child to his hometown, Bade Town.
The three Grandpa, grandson, and nephew all live interdependent days.
However, inside the swaddling clothes is not a human baby,
But a monster…

Black egg body, white ring eyes, red mouth.
A child, ah! Doesn’t he have two eyes and a mouth! Resembling an egg, he is Ji Huan’s cute nephew!

Vermilion tiled wall, white lotus pond, convalescent courtyard.
This entirely neatly handsome and elegant young man: Ah Jin.
However, he told Ji Huan about the secrets of the monsters and discreetly taught him.
Bade Town is also slowly being covered in monsters…

Or, the record of a small countryside monster’s growth.

- Description from Novelupdates

In a world ruled by ancient powers and hidden forces, Caelen was just another face in the crowd — until a mysterious encounter with a radiant woman awakened something deep within him.The Lust System.With it, Caelen begins a path of relentless evolution. Every woman who bonds with him fuels his growth — not just in strength, but in influence, power, and legacy. But these aren't passive followers. They're warriors, leaders, and legends in their own right — elf queens, demon generals, angelic saints, dragon-blooded fighters, and more.Each woman brings unique abilities and ambitions of her own. Together, they don’t just stand beside Caelen — they fight, conquer, and shape the world with him.As old factions tremble and new enemies rise from sacred temples, fallen clans, and forgotten bloodlines, Caelen must lead his allies through a crumbling world, forging a new age in fire, desire, and war.This is not just his rise.This is their revolution.