In the beginning, there were just one world. A world filled with humans, Suddenly a anomaly came making Rifts around the world these rifts connect to another world, a world filled with horrifying monsters.
These monsters invaded earth and killed 2 Billion People, The Army tried to fend of the monsters but it was still futile.
When all Hope was Lost, God gave 6 People Special Gifts Called "System". The System Gave them different Classes, These Classes are Warrior/Fighter, Archer/Ranger, Berserker, Tank, Mage and Scholar.
In 6 of the Classes there was 1 special that stood out of the 6, It was Scholar. Scholar can use all of the other Classes skills and abilities.
The 6 Gifted people call themselves as Jaegers, They began there quest to get rid of the monsters that invaded earth, They succeeded on getting rid of the monsters on earth but as time goes on more monsters came through rifts to reek havoc again.
The Jaegers knew that they need more people to have the system to make the world safe again, So The Scholar Sacrifice himself to give every new born the "SYSTEM".
The Jaegers Taught the kids how to use the system and how to get their different classes but not 1 kid got The Scholar Class, As time goes on The Scholar Class became a Myth.
It has been a Thousand Years since then, Everyone around the world have the system but they decided to not become a Jaeger because of how Dangerous it is, So they decided to have a normal life.
The World was Safe again and their Economy was now The Monster Parts and Crystal. Crystal is good for magical armor, jewelry and weapons while for monster parts are great for Fertilizer, So The Jaegers Trade those for money at the Jaeger Association or H.E.L.I.O.S. Hunter Economic Law International Operative Society.
Now the Story continues to a kid that wants to be the Strongest Jaeger in the World. His name is Matsuno Takumi.