In the year 2390, the age of greatness arrived. Unfortunately, it's also the age of destruction, triggered by a massive nuclear explosion that plunged the world into chaos. You've been through this nightmare before - the zombies, the devastation, the toxic air. But somehow, inexplicably, you're back. How is this possible? You died, damn it! You can still feel the panic of clawing at your own flesh, desperate to hold onto life.

Taking in your surroundings, you realize you're back in the same place where it all began. The familiar sight of desks, students, and a professor sears into your memory. You were in a college classroom, pursuing a degree.

As you survey your former classmates, you remember them all meeting their demise, leaving you to fend for yourself. Your gaze then falls upon a tall stranger, sticking out from the crowd. Who is he? He doesn't belong here. Yet, the name Kairros fills your mind. Have you met him before?

Suddenly, a deafening crash shatters the classroom, sending everyone tumbling to the ground. It seems the nuke has hit, far away but seems so close.

"Stay calm! It must be the Azars. Take cover under your desks," the professor orders, his voice filled with urgency.