Once, the earth was untainted.Humans thrived and lived in comfort.One day, from the pacific they have risen.The sun turned blue.A whole continent with unworldly beasts brandishing their weapons and unknown arts.They had no ability or interest in diplomacy.They only killed, pillaged and settled.Humanity had no choice, but to go on a full-blown war for survival.We lost. And it's been one hundred years. Countries perished and only remained ruins of it. In this post-apocalyptic scenario, humans hid their cities underground.With the state and corporations organizing and ruling the cities.Still, humans don’t know how to give up.Rebuilding and getting stronger for vengeance.In a looting expedition, a mysterious boy is found inside a crystal, what lies in the future for him and for the human race?