Sin System: Demonic Harem After Reincarnation - Chapter 3

The world experienced a cataclysmic change, and countless spatial gateways appeared out of thin air.

Exotic beasts of all shapes and sizes swarmed out of those aforementioned spatial gateways, forcing the humans to face the crucial moment for their survival.

In order to search for a chance at survival, brave warriors from the army and scientific researchers risked their lives and entered the world beyond the spatial gateways. To their surprise, they discovered that there was a chance of obtaining beast cards by killing these exotic beasts in their world.

Those with extraordinary spiritual strength are able to utilize the beast cards, perhaps transforming the cards into the beasts’ combat bodies while they were still alive, or transforming them into weapons or defensive gears, or…

A new occupation came into existence following the changes, known as beastmasters.

A transcender with two souls fused into one found himself in this magnificent new world full of waves, rising step by step as he ascends into the seat of a godly beastmaster.

- Description from Novelupdates

How can there be any invincibility?

How can there be any Xeon undefeated?

No one in this world can be eternally number one, anyone can be defeated.

including me.

I’ve been waiting for that one person to show up, beat me, tell me that my way is wrong.

It’s a pity that that person hasn’t come yet.

…

False martial arts: strengthen yourself, break the limits of the human body, and resist bullets with flesh and blood.

Real martial arts: use the magnetic field of life to dominate the magnetic field of the stars, use the small universe of the human body to attract the power of the big universe, travel the starry sky, and smash the planet.

- Description from novelbuddy

Giles transmigrated to a world where everyone practiced beast-taming, and he was adopted by the owner of a beast-taming arena from a young. However, Giles could only run errands and do basic chores since he didn’t have any talent for beast-taming.

One day, the arena owner had to go on a long trip, so he entrusted Giles with the management of the arena.

Faced with a bunch of baby beasts waiting to be fed, the inexperienced Giles could only tell them about the stories that he’d heard from his past life. [Pet Beast Guru Duck finished listening to “The Ugly Duckling”, evolved into an “Eight-winged Swan Beast”!] [Pet Beast Beetle Bug finished listening to “Godzilla”, evolved to learn “Ultra Heat Beam”!] [Pet Beast Lil Ape finished listening to “King Kong”, evolved into an “Invincible King Kong Beast”!] [Pet Beast Green Haired Dog finished listening to “Greek Mythology”, evolved into a “Cerberus”!] Even that rock pet beast in the corner.

After listening to Giles telling the story of “Journey to the West”, the rock split open and evolved into the Ancient God-tier pet beast, “Heavenly Sage Sun Wukong”!

When the arena owner returned, he was stunned, I told you to take care of the arena, and you trained them all to become Divine Beasts?!

It's been 25 years since the apocalypse, when the world we knew changed forever. It was then that terrible monsters appeared and some of humanity evolved to fight them.Seraphine a 18 year old citizen in Newber, was living a peaceful life with her parents, learning at the Academy, to get a nice job within the government. At least, until everything turned for the worse and she ended up as an Evolved in a destroyed city.