Toaru Majutsu no Index - Volume 5, Chapter 3: A Certain Misaka’s Final Signal. Tender_or_Sugary.

"Your bed is cold," spoke a voice in the room that had her eyes go wide in fear. Nervously, she turned around, gulping softly to see a shadow on her bed as if someone laid down there. The man who had been lying down sat up emerging out from the shadows where he had been waiting for her.

Ruins stretched across the landscape in the apocalypse after the nuclear war.

If you accidentally survived on the wasteland, then you must be ready to face the endless hunger, ceaseless dangers, the mad zombies at night, and the peculiar mutant creatures that are the aftermaths of the constant radiation.

But for Jiang Chen, this place was heaven.

Mansions stood tall, luxurious cars parked on the street, high tech products and gold abandoned everywhere.

What? You were the president of a game development company before the war? You were responsible for the development of the 3D virtual reality online multiplayer game? Well, that’s great, why don’t you come work for me. The salary is two pieces of bread a day.

iPhone? Ultra thin design? Don’t you see that the phone I invented are thinner than condoms?

Aircraft carrier? Fighter jets? Oh, I have those things as well, but they are designed for space combat.

Watch the story of Jiang Chen, who possessed the ability to travel through space and time, as he witness the creation of an empire stretched across space and time..

- Description from Novelupdates

Starting as a fallen noble? Struggling with hunger? Having to pay high taxes to the king? If you don’t pay enough, your head will be chopped off?Romon activates the Lord Simulator and begins with a village...[Your subjects discover a large amount of magic crystal ore while digging on the western side of your territory!][Your territory's culture improves, and your rapid-fire mage develops: Orbital Magic!][You successfully expand your territory and discover an underground labyrinth city on the new land!][You annex the land and gain a new title: Duke of Thune!][The king passes away, war breaks out, and you decide: to annex all lords and establish a new kingdom!]Romon: “Annexing the world is for better simulation, leading the world to ascend efficiently—how can you call it personal ambition?”

A slime randomly falls into existence. Sapient and born with the ability to recreate parts of the things it preys upon, the highly confused drop of primordial soup decides that the only real thing it can do is become the being at the top of the food chain. A task of longevity in the leaves of the Omniverse.