The Forces of Dark & Light

There is a realm that exists in which amity and harmony is only found if both light and darkness sustain a balance.
Light cannot exist without darkness.
And there is no darkness without the presence of light.
It remained that way for a long time, each depending on the other. Until one day... The knot of affinity was untied, the scale of symmetry disrupted and the Darks conspired an audacious move, in all of history, they dared to be the first who violated the law, or as is assumed.
Yet it was the fluttering, dim light of... faithfulness and hope. For in the midst of all loss and misery, are lives that, though young, certainly have the treasure of strength buried within.
Here is where the five Lightling siblings enter the stage, each with roles in a play they can't abandon, entrusted to preform in a high-stake action performance with the ending indefinite. Their life never quieted down from then, for there were plenty of secrets hidden and plenty of secrets to be found.
The stage isn't full yet, for it has promised the Troys their part as well. The Troys follow a similar story, except while being in triumph for having escaped their imprisoning orphanage, that euphoria was short-lived as the three siblings get shoved into the sewer of their wickedest nightmares.
None has asked to be apart of this theatrics where life and death is on the line, how long can they keep dodging death as it hurtles its way at them through life-threatening situations?
With each decision made, a battle is drawn closer, a campaign that, with the outcome unknown, is the thin line between victory, freedom and the ruin of their realm.
The battle where opposing forces that rely on each other, clash, in fight for justice, in fight for freedom.
Can the balance be returned once again?