Extra's Harem: Invincibility Starts with Marriage and lots of Children - Chapter 4 - - Satan

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.

In the year Jin Stratus was born, Humanity had long since conquered the stars, with their sights now set on a cosmos filled with unimaginable horrors.Yet in a universe that is but one bubble in an endless sea of realities, on a worthless blue planet beneath a crumbling city, a slum rat named Jin Stratus awakens to his destiny.When the “Door to the Myriad Worlds” descends, Jin steps through, armed with nothing but his unyielding will and his innate comprehension-defying talent—“Against-Heaven’s Understanding.”In the Great Universe of the Starry Sea, where ancient beings can erase galaxies with a sigh and traverse endless light-years in a single stride, Jin is nothing but dust. But with each battle, each world, and each bloody step, he transcends the world that seeks to oppress him, forging himself into a being unrivaled across all realms.[Your Understanding is Against-Heaven.]-You have comprehended the “Bone Marrow Blood Tempering Divine Technique.”-You have evolved “Fist of Falling Thunder” into the “Thunder World Creation Technique.”-You have witnessed the collapse and rebirth of worlds, grasping the “Cosmic Palm Domain.”-You have obtained the “Limitless Incarnation Method.”From the gutter alleys of the Lower Slums to the endless cosmos, Jin Stratus will ensure the world remembers his name—For throughout heaven and earth, he alone… can comprehend it all.And he alone will become the strongest.

In a tyrannical world, what is evil? What is benevolence? All living creatures are brutal. Passing through the heaven road to find one’s purpose in life. Struggles to be stronger is not an easy path. The whole journey thistles and thorns, one blade chops open a path, I alone will be supreme!

- Description from Novelupdates

Alexander Chen's life ended in the most horrific way imaginable—betrayed by someone he loved and harvested like spare parts while still conscious. But death wasn't the end. In a flash of impossible light, he awakens in the body of Kael Ashford, heir to one of the most powerful dukedoms in the kingdom of Valoris.This new world revolves around supernatural abilities discovered through an Awakening Ceremony at nineteen, where powers are measured from the weakest F-class to the legendary SS-class. The Classification Stone, an ancient artifact, reveals and categorizes every citizen's potential.As Alex navigates his new identity, he discovers he possesses mysterious abilities that hint at power beyond the kingdom's understanding. With infinite magical energy and strength that defies measurement, he's either incredibly powerful or incredibly broken—and he has no idea which.Haunted by memories of betrayal and murder, Alex refuses to be anyone's victim again. In a world where strength determines survival and political intrigue lurks behind every smile, he must protect himself from those who would use or eliminate what they cannot understand.In a realm where power is everything, what happens when someone awakens with the power to rewrite the rules themselves?