In the past, once upon a time, the leader of Modest was a friend (in war between the super powered) of the leader of Unknown.
Modest's leader, being the selfish and bossy one, demanded for the Unknown's leader to do something so horrid that no one ever decides to speak of it.
Unknown's leader, being the heroic and kindhearted one, refused to do so. This made Modest's leader furious.
Modest burns down a warehouse that belonged to Unknown.
At that moment, Modest and Unknown's alliance has fallen creating a war between themselves.
After one mission including 4 boys, they receive a letter that may end the war if they cross the land belonging to Modest to get to Modest's HQ and take on Modest's leader (the second), the war may end and Unknown wins. If they lose the fight, well, they die and Modest wins.
Along the way, not to sound so cheesy but, two of the four boys can't help but get themselves into something only the pair can fix.