The Human Civilization is on the brink of being wiped out. Only the last kingdom remains. Demonic beasts are the cause of this nightmarish situation. They would've annihilated the human race if the Beast Tamers haven't appeared. With their Beast Taming Seals, they can capture and command the Demonic Beasts, turning enemies into allies. They are the guardians of humanity who have forced open a safe haven for humans in a world overrun by demonic beasts.
Ray, a law-abiding citizen with three part time jobs, transmigrated into this world after he was killed, finding himself a participant in the Beast Tamer Trial.
If he fail, he would have to resume the original owner life and suffer endlessly until his death. If he succeeds, he would become a beast tamer, a privileged member of society.
Luckily, the perk of a transmigrator arrived.
[You have been bestowed the Strongest Beast Taming System!]
[You have tamed your first beast, the King of Slimes!]
[The Skill and EXP Sharing features has been unlocked!]
[You can use all the skills of your tamed beasts.]
[Everytime your tamed beasts kill a creature, you will gain EXP to level up.]
While others were struggling to find ways to evolve their tamed beasts, Ray levelled up like crazy.