The world changed.
Portals assaulted the world with monsters from fantasy worlds, but the humans weren't helpless.
Simultaneously all humans were blessed by the gods and acquired systems to strengthen themselves. But for some humans, it was different.
Transmigrators
Instead of awakening an average system like the rest of humankind, transmigrators were pulled to another world and given a special system. They were made a promise that if they accomplished their quest they would be sent back. The strength granted to them by their systems was immense, no regular human could stand against them.
Then, there's Alex.
Alex gets nothing.
He is not blessed by the gods, but he did get accidently transmigrated.
Alone and confused, Alex seeks survival.
And what is the best way to survive?
To become strong, strong enough no man, no god can hurt him.