100 years ago, on July 29th a disaster happened. This disaster almost led the humanity into extinction. The disaster was caused by the Giant monsters or so called "The First Rulers"

Many believed that this monsters are reawakened to take back the earth which is originally their home, and we the humanity is just a species that is originally created to be a slave for them, "The First Rulers".

The humanity was hopeless, and some accepted their faith that they cannot even do one thing to win against this Giant Monsters.

Miraculously, the humanity was saved from extinction by someone who the humans believed that was sent from heaven. There were called "The Quatro Milagros".

Then the fight begins.

"The first rulers" vs "The Quatro Milagros"

The fight was intense, that it goes beyond the expectation of humans. The level of their power is nearly matched, and so was their intelligence. The fight carried on for several days, but in the end the fight turned out to be tied. The Quatro Milagros could've won but they were in a disadvantage since the number of Monsters are incomparable to them. The humanity was devastated as they expected that "The Quatro Milagros" would deafeat the Giant monsters. Once again the humanity was hopeless thinking that they would never get the peace they wanted and would continue their hellish experience if the Giant monsters would gain their consciousness from the fight.

The Quatro Milagros gained their consciousness before the Giants, and used their remaining energy to tell the humanity a long message that soon after would change the world.

"Fret not earthlings, this monsters aren't going to attack you as for now. They will retreat and hide somewhere in this world,

Since they've lost alot of their power from our fight. It should take years to conserve and retake their powers. But it doesn't mean that you will live in peace in some time now. This Monsters are persistent. They would never waste a single minute from now on once they've regained their consciousness, especially their motive is likely to conquer the earth back. Because we especially made the earth for them to have a home. This Monsters are once our battle comrades.

We nearly have the exact same level of power. And one day we have won the battle against our enemies, and they call themselves 'The Marching Devils' . When everything is peaceful since the war and the fight was ended, out of the blue this monsters decided to destroy and betray the earth and fled to the Empire of 'The Marching Devils' , that was our enemy. We don't know the reason why they did that, and also their motive why they decided to take back the earth. So we decided to treat and see them as traitors. We tell you this that you earthlings, shall not live like the way you do. Thy shall not worry when we said that you earthlings will not live like you do, we won't change every aspect that you do, it would be just adding something from all of you that could protect you from this traitors. "

Then the Quatro Milagros proceeds to give something to the remaining humans who survived the disaster.

A skill.

Not just ordinary skills. It's a skill that allows the certain person to have extraordinary power that can defeat the Giant Monsters. And it's even possible for a mere human to surpass the unbelievable power of the so called "The first Rulers". But it can only be awakened if a certain person will weild a certain weapon.