"Congratulations on becoming the 100th lucky user of 'Late Night Mailbox'. Your life balance is less than seven days. I wish you a happy game."
Momo, an ordinary social worker, received a strange email on his birthday night.
I thought it was someone's prank, but I found that the city was quietly changing. The mask vendor on the street corner sells products that can "save life", the neighbor's cat talks about the rules of death on the third day, and the company's elevator will unconditionally lead to the "hell layer" at midnight.
What's even more frightening is that he discovered that this was not a separate game. Countless "lucky users" like him are struggling to survive. Some are trying to solve the puzzles, while others are becoming "catchers" hunting similar people in the dark.
In order to survive, Mo Mo must use the incomplete "rules" that are constantly sent to him to find out the truth behind the "late night mailbox" in the cycle of seven days.
"Wait, this rule... Seems to have been written by me myself to the past?"
