MTL - Naruto: The Village is on the Verge of Bankruptcy, I Dug Out the Oil - Chapter 366

A girl who calls herself a demon appeared before a timid student named Fumio Kijima. The girl claims to be a campaign girl from the demon world and she gives him the ability to “summon a room” from nothing but thin air.

At first he doesn’t abuse his power and uses it as a convenient ability in his every day life. But one day he is bullied by his classmates under a false pretext and is made to suffer. In the past he would have wallowed in misery and cried himself to sleep, but now he had a power to call upon.

“I will make them regret it!”

Using his powers to summon his “room”, he begins his era of confinement and brainwashing to achieve his goals.

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.

“When everyone scorned me because I was merely a woman, I kept convincing myself: ‘Actually, you can give it a try.’” – Fang Feng Sheng

…

There was a famous saying in officialdom: there is no yamen without Shaoxing.

She was the only descendant of the Fang family, the most prominent family of private advisors in Shaoxing.

A calamity broke the Fang family apart. Her father was implicated and put to death, and she cut her way through thistles and thorns to prove her name.

However, walking down this path, she discovered that there were things beyond her imagination.

~ ~

Zong Yue knows that he could marry Fang Feng Sheng because he had blocked all her paths of retreat. But it doesn’t matter—one day, the person will become his, and so will her heart.

- Description from Novelupdates