Humanity's Strongest Loser(dropped)

In 2291, Demons invaded the world without notice and almost 70% of the population was wiped out. But, humans preserved and fought back.

Even so, survival is harsh in this apocalyptic world. Therefore the remaining humans implemented a hierarchy to maintain order and "peace". The strong are respected and prioritized while the weak are trampled upon.

At the very bottom, are humans without any fighting capability. They are called "Workers" although people call them "slaves". Everyone believed that they are losers who will never succeed and will always spend their lives serving others. To everyone, they are nothing but disposable livestock.

Or at least that's what they thought until a certain man shows up...

This novel contains violence.
*cover art is definitely not mine*
(I can't draw that well)