After the end of the apocalypse, the Earth is not what it used to be, it has evolved into a fantasy planet, and it is more than ten times larger than before.

 Numerous creatures that solely exist in fantasy began to exist on earth due to the evolution of the Earth. With the birth of this fantasy creature, humankind will be threatened with extinction.  

 Thus, nearly all humans decide to forget ethnicity, skin color, and country to unite and build a kingdom that is exclusively for mankind, the Atlas Kingdom.

 The name Atlas is taken from the name of a middle-aged man who played a big role in protecting humankind when the apocalypse occurred.  John Atlas, who was the man's son, desired to be king.  Although there was a lot of opposition to this election, with the support of scientists who owed his father, in addition, science is very crucial to face this dark age, therefore John was still elected as king on the condition that four people would be elected to be the king's counselor.

 With existing knowledge, this kingdom can survive through these dark and difficult times, but year after year this nation is getting smaller and smaller. It is becoming a big crisis for the country because the number of people is growing rapidly.

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 This occurs because the Earth's resources are very limited and practically exhausted due to the appearance of dungeons filled with monsters in several locations in the kingdom.  Even this monster will come out to attack the people near the dungeon.

 Although humans have evolved and some of them have unnatural powers, most of them are too dependent on hot weapons which are more effective and safe.  There were even some corporations that bought the body of the monster to be used to make robot suits, which came to be favored among the military at the time because it made it easier to resist the monster.

 Yet even if the dungeons were successfully eliminated, the number of dungeons did not decline. 

There were some dungeons inhabited by monsters that were very powerful and impossible to defeat.

 Like it or not, the area has to be abandoned or use nuclear weapons. Although this method can solve this problem, it is still harmful to the kingdom.

 Soldiers were also sent out, but this mission was unsuccessful and nearly all the soldiers perished. According to those who survived, after leaving the kingdom, they were hunted not only by monsters but also by elves and goblins.

 After listening to the advice of the four national counselors, Justin Atlas, who is the second king of the Atlas Kingdom, will use 70 percent of the country's wealth to fund an association responsible for solving this crisis.  

The members of this association are chosen from talented people, especially those who have unnatural powers known as abilities. They will also be trained to fight and gradually master their power without the use of hot weapons.  This association is named Heroes Association.