A pair of women, one pregnant, face the myriad dangers of a post-nuclear winter world. They are searching for a rumored stronghold of civilization, known only as The Library, and must find it if the infant is to have any chance of survival.
Ayane is the daughter of a karaage (fried food) store owner, but she never liked karaage. Eventually, she left home, only to return 5 years later. Her family lives in the city of Usa in Oita Prefecture, Japan. She brings with her a young girl named Shirley, who is her step-daughter from her ex-husband.