"Kamisama no Inai Nichiyōbi," also known as "Sunday Without God," is a Japanese light novel series written by Fuyumi Ono. The story is set in a world where God has abandoned humanity, resulting in a peculiar situation where people no longer age or die. This leads to a society grappling with the implications of immortality and the absence of death. The protagonist, Ai Astin, is a young girl who serves as a gravekeeper, tasked with helping the deceased find peace. Throughout her journey, she encounters various characters, including Hampnie Hambart, who challenge her understanding of life, death, and the meaning of existence in a world devoid of divine intervention.