The protagonist inherits a small supermarket in a township that is on the verge of bankruptcy. One day, he discovers that when the back door of the supermarket is opened, it does not lead to a warehouse, but to a different time and space——
· Monday: The back door leads to the ancient border battlefield (Western Han Dynasty, Li Guang period)
· Tuesday: Road to Shanghai in the Republic of China (1928, the period of gang war)
· Wednesday: To the future wasteland world (2157, radiation everywhere)
· A world is randomly refreshed every day and resets at 12pm
