You stand behind the checkout counter of an unmanned supermarket for the first time. Outside the glass door, survivors are smashing it down to loot supplies. The security robot's patrol light sweeps across the shelves, and a cold system prompt sounds in your ear: 'Temporary manager binding successful. Complete your first inventory within three hours, or the supermarket will be permanently closed.' You look at the few remaining boxes of water and instant noodles on the shelves, then at the hungry eyes outside the door—you know this supermarket is your battlefield.