One Day Is All It Takes

"One day is all it takes for the system to collapse." Eren said, much to Levi's surprise.
Their king was dead, wall Rose was on the brink of collapse and everything looked bleak when Armin and Mikasa didn't return from a trip outside of the walls, which Eren had returned from. He didn't want to retreat, so Levi dragged him back with the one arm arm he had left. That's right, Levi lost an arm, for Eren to live. Life for the humans was only getting harder. Would the system they had devised and minimal means of survival with the resources they had collapse? Would their be a repeat of the events of five years ago? Did Eren really have anything to lose? He'd lost his mother, Mikasa, Armin and his father had given him a power that turned his life upside-down and told him to do something that could cause him to lose his life, followed by disappearing. Why did Eren keep going? Did he really want to go into that cellar? Would Levi help him?