DxD: Matsuda? - Chapter 70: King Of Kuoh Academy?

Based on the popular Vocaloid series, by HoneyWorks, called “Kokuhoku Yokou Renshuu (Confession Rehearsal)“:

Natsuki, a third-year at Sakuragaoka High School, who holds unrequited feelings for her childhood friend, Yuu, who’s in the Film Club. However, instead of being honest about her feelings, she makes him be her confession “rehearsal” partner. Unable to say her true feelings, things start to get complicated when Miou and Akari, who are also in the Art Club, get involved! Will she ever be able to confess for real!?

Wake up and an unknown door has appeared in your home… Behind each door is a completely unfamiliar world.In the nightmare world, Jiang Cheng relays the news from the Hunk to the Fatty, adding his own spin to the story.The Fatty almost cried in fear hearing it.“My whole family will be strung upside down for blood-letting if I die here?”“That’s what I heard.”“Then, how come you don’t look scared at all?” The fatty widened his eyes.Jiang Cheng turned around and replied in a very formal tone, “Because I’m an orphan.”

Humanity was finally recovering from the wave of an unknown Mana Apocalypse that had turned the world upside down.

A world where Science had married Magic. Advanced technology had mixed with magic spells.

Monsters took over the world and remarked earth's cities and countries as their kingdom. Half of humanity took the path of magic to survive, and half of humanity took the help of their advanced technology to survive. But what if humanity turns against humanity? The world split into two groups- The Science Users and The Mana Users

Hitori, who happens to be in the Mana Users group hates magic and spells. Saibai Hitori's passion, pleasure, and happiness lie in gaming. He unlocks the solo Cultivation System and the ability to cultivate in and outside the most popular game.

[The Emperor of the Apocalypse] is currently the best VRMMORGP open-world, kingdom-building survival game in the world. In this apocalyptic world, players try to clear dungeons marked on the map to mark that as their territory and eventually become the one and only Emperor of the Apocalypse.

In times of destruction, trusting someone will only destroy you. Players and guilds started attacking each other in the game. Guild Vs. Guild, Player Vs. Player, Player Vs. Environment, Realm vs. Realm. Everything is on, everything is going down.

Hitori's goal is to unravel the secret behind his parents' death and become the Emperor of the Apocalypse.

In a world where humans evolve and survive, only I cultivate and conquer.

Overnight, Tangning became a big slave owner in the southern United States with three large plantations and hundreds of black slaves who could be driven at will.

Tangning was very satisfied with the result of such a time-travel, but then he sadly discovered that he could only enjoy three years of such a good life, because three years later would be the “Civil War”, what should he do after this?

- Description from novelbuddy