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On Sunday, God abandoned the world, after admitting failure. Ai is the 12 year-old child of a Grave Keeper, and a man by the name Hampnie Hambart. Her mother told her that one day, her father would come to the village. One day, long after her mother has passed, a mysterious man claiming to be Hampnie Hambart massacres Ai's village, and requests that she bury the dead, as a Grave Keeper.