Yuji Kaido  

, 海堂祐司

In the near future, an individual worked at a gas station until they were diagnosed with a life-threatening illness that necessitated cryogenic preservation to prevent further deterioration. After being revived in the distant past, he discovers that his world has been destroyed by the Blue. The protagonist embarks on a journey to Second Earth, where they must learn how to protect themselves and others as they encounter more of the devastated planet and its inhabitants. Throughout the series, the character's mental state fluctuates significantly due to their exposure to the ruined earth and encounters with various survivors.