Every time he wakes up, Wang Xu returns to April 1st at 23:00. While others are still bustling about for tomorrow, he has already seen the gray fog swallow the city. Restarting once can avoid crises; restarting countless times, can he rewrite the end of the world? From surviving alone to standing shoulder-to-shoulder with companions, he follows the clues left behind by each save file rollback, heading toward a maze where reality and antiquity intersect. But when hope finally reveals a glimmer of light, he discovers that the world he is familiar with seems to hide another set of rules.