Doomsday: For every day I survive, I get a reward.

After the apocalypse, David was robbed and nearly beaten to death for kindly opening his door to a little girl. In his despair, David awakened a sign-in system that rewards him with various benefits for daily check-ins, including supplies, house renovations, weapons, and more. Revived, David resolves never to open the door for those neighbors again, determined to survive in his safe house until the end of the apocalypse.