My Dungeon Life: Rise of the Slave Harem - Chapter 912

There was a woman. Born as an illegitimate child and raised under the strict control of the queen, her world was as small as a well.

There was a man. He was forced to marry a woman who was his brother’s political marriage partner. His world, which was infinitely wide, became smaller.

The woman’s original sin, and the man’s resentment. “I should have just died instead…”

The end of the world is coming, the world has undergone great changes, and everything has changed. Plants, animals, and even insects, as long as there are living things, have mutated.
Become more powerful, and even evolved supernatural abilities, such as chickens and ducks that can fly to the sky, such as cats and dogs that can breathe fire.
But only humans, without any obvious changes, seem to have fallen from the top of the food chain to the bottom of the food chain overnight.
Any creature that can open its mouth to eat can treat humans as food.
But fortunately, this world has not completely killed humans. Gradually, humans discovered that they had the ability to cultivate compatibility with other creatures.
As long as it has a high degree of compatibility with some powerful mutant creatures, it can be used for its own use to achieve the purpose of protecting itself.
Fang He is a person who is very compatible with mutant animals, but it is also because of his ability that he has changed from the strongest to the stupidest.
Fang He, who was reborn, said, “Hmph, this time…”

- Description from novelbuddy

Liola—the best assassin in his world—has vowed to kill no more. He was being chased by an assassination organization when he accidentally dropped into a parallel universe: through a dimensional gate and into poor teenager Kaiser’s apartment. Instead of going to the government shelter for lost dimensional travelers, Liola and Kaiser wind up going to school together.

Liola has been trying his best to live the life of an ordinary person, but after certain things happen one after the other, he begins to realize that being an ordinary person could be harder than being an assassin.

“You call yourself a hero? After your greed killed my sister?”What would you do if all of your friends, everyone you ever loved besides your sister, died in front of you?What would you do if, because you were weak, everyone hated you and considered you a Wasted, someone who hurt humanity's chance to survive extinction?Adam continued fighting despite this abuse, because he still had 1 simple goal: even if he was nothing more than cannon fodder or wasted potential, he would keep his sister safe.But then, it wasn't the Kaiju or apocalypse that killed her. It was the Exalted, the strong, the heroes of society.The people he was supposed to praise were the ones who took his last hope in life away before killing Adam as well.So, when he regressed with a villain system that rewarded him for killing Exalted...[First Exalted killed!][Artifact: The Mantle has upgraded to level 2!]