OLD-WORLD EXTRA - Chapter 14: Obligation

-The well-known characters of your favourite series get into orgy-In a world where anime universes collide, an omnipotent, perverted god known as The Great Weeb Overlord grows bored of endless power fantasies and shonen battles. Instead of another tournament arc, he decides to host the ultimate crossover event—one fueled by raw passion, unfiltered ecchi energy, and the deepest desires of fandom itself.When Kazuya, an average, luckless otaku, is inexplicably summoned as the “Chosen One” to oversee this legendary gathering of flesh, he finds himself surrounded by the most iconic waifus and husbandos of all time—Asuka, Rem, Bulma, Zero Two, Hinata, Erza, Akeno, Saber, Makima, and many more. Even some of the most unexpected faces (yes, even from wholesome anime) are caught in the gravitational pull of this sinful singularity.As the Ultimate Fan Service begins, Kazuya must navigate the chaotic pleasure-fest while avoiding jealous yanderes, tsundere slap-fests, and the terrifying wrath of overpowered shonen protagonists who refuse to share the spotlight. But with reality itself warping under the influence of peak degeneracy, Kazuya soon realizes there may be no escape… and worse—he might actually enjoy it.Will he survive this NSFW isekai experience? Or will he be consumed by the horny abyss?One thing’s for sure—this is not your average anime crossover.

Keeley, a simple plain Jane, hits the jackpot. [No, she did not win the lottery!] At least that's what she thinks when she marries the most eligible bachelor in New York City: Aaron, a wealthy cold-hearted heartthrob and Tycoon.

The scum’s or villain’s long road of transformation was tentatively set to the world:
The abandonment of the educated youth’s wife (Completed)
The hidden marriage of the scum film emperor (Completed)
The best brother in the world (Completed)
The Phoenix male who destroy the bridge after crossing the river (Completed)
The treasonous general (Completed)
I’m an honest man (Completed)
To become the top scorer in the School of Agriculture (Completed)
The soft rice man’s self-cultivation (Completed)
The whole world is reborn (Completed)
I want to survive on a desert island (Completed)
The stallion male who has seized the opportunity (Completed)
The perverted self-salvation (Completed)
The spring of the loafer (Completed)
The misplaced life (Completed)
The miser career (Completed)
The ghost is out of feeling (Completed)
The Queen’s favorite husband (Completed)
The vicious girl with her godfather (Completed)
I want to be a good person (Completed)
I does not tear up the family (Completed)
The perverted common plant (Completed)
The Mary Sue’s men (Completed)
Every time I was reborn, someone wants to kill me (Completed)
The old people’s counterattack path (Completed)
The global evolution (Completed)
When I became a net red (Completed)
For you, good person (Completed)
His heart had white moonlight (Completed)

- Description from Novelupdates

The protagonist is reborn in the world of the game he loved so much – [Dungeon Brave Souls]. However, he was reborn not as a hero who adventures with the heroine while flirting with her, but as a villain who steals the heroine and drives the world to extinction.

Why in the world should he be reborn as a villain who ruined his favorite game? The protagonist is in despair, but he still decides to live his second life freely, using his knowledge of the game. However, the reality is not as good as he expected. Events that should not have happened in the game, scenario changes happen one after another…!

The villainous character crushes both the demon king and the heroes. A heroic tale of evil supremacy!