Eros, a world about the same as earth, only, a hundred times larger. Although there are animals and other life forms the same as earth, this world also contains other stronger beasts.
Each City is far away from another, it's due to the beasts that couldn't leave the humans alone. But the world's population is around 40 billion.
Karas, known as an orphan without any linage or history, bound by the shackles of poverty, lived his life all alone, well... that is due to his own misgiving, he couldn't escape his current status and blamed it all on the world.
But as he was in the military university, the world entered a drastic change, beasts started to evolve, strong beasts became stronger, the weak ones grew fiercer, and everything started to drag humanity to the food pyramid.
Humanity in less than one year lost more than 99% of its total population, the remaining no more than a hundred million people hid or somehow managed to fight back.
Karas... he had managed to evolve with it, but the time he evolved was a little too late, he only managed to become stronger after eight years.
He was too late, the 30th year of the world's sudden revolution, he died at the maws of a... dragon!
But playful as it may seem, fate seemed to have deemed him not done yet.
Karas had a rebirth, to the life when he was still 16 years old, combined that with a system that had suddenly appeared, he was motivated to not fail again, to change things... to change his miserable fate!
Embark in the epic life of Karas and his achievement? It'll be legendary!