In another novel by this author, a wedding "upstream" results in the protagonist's daughter dying of pneumonia, as she failed to respect the direction that the title river flows.
In one work by this author, Emi and Yamagishi, a student couple who say they are married, move into a vacant cottage on the protagonist's family's lot, partly to take care of a man they call "Mr. Hello".  In another novel by this author, a wedding "upstream" results in the protagonist's daughter dying of pneumonia, as she failed to respect the direction that the title river flows. A copy of the Honzo Komoku stands in for the husband in a wedding ceremony of another novel by this author, one of whose novel details Akiko's year-long struggle to care for her senile father-in-law, Shigezo, while another is about Hana's relationships with her grandmother, daughter Fumio, and granddaughter Hanako from her marriage to her death. This author of The Twilight Years and The River Ki also wrote about the title character Kae, who goes blind from the tsusensan her husband invents as a general anesthetic, while competing for Seishu's affections with her mother-in-law Otsugi. For 10 points, name this author of The Doctor's Wife. 
In one work by this author, Emi and Yamagishi, a student couple who say they are married, move into a vacant cottage on the protagonist's family's lot, partly to take care of a man they call "Mr. Hello".  
Ariyoshi Sawako [prompt on "Sawako"]