The Back-Flow Rain

Legend has it that city Sa witnesses a back-flow rain falling from the ground to the sky on every summer solstice. The girl's parents failed to look for the rain when they were young. Later, her mother vanished with the broken marriage, leaving an anthology of Xiao Hong, a feminism writer in China, which was the only clue for the girl to search for her mother. Then the girl set out on a journey to find her mother.