Manga by author Ashihara Hinako

From Aerandria Scans:One day, Mizuho, a university student, receive news that her classmate in high school, Origuchi Haruka, passed away. Mizuho doesn't remember being best friends with Origuchi, but apparently, Origuchi told her mother that Mizuho was her best friend. And now, her mother wants Mizuho to help her find the boy Origuchi dated during high school. Mizuho told Origuchi's mother that Origuchi was a very plain girl, and she was never seen with a guy, but her mother told Mizuho that Origuchi got pregnant and had an abortion when she was in high school. Mizuho was shocked, but she still starts asking her other classmates in high school and following the traces Origuchi left behind.

Life isn't going too well for Yuzuki. She's a 34-years-old and without a boyfriend. The elementary school she works at is close to firing her, and to top it off she doesn't know what to do with her life at all. But even when she quits her job and tries to have an arranged marriage things don't work out. Only the bread she eats at the small stationery store around the corner gives her comfort. So one day, she asks the storeowner to marry her on a whim and to her surprise, he agrees...?