From ANN:
The manga centers on 35-year-old novelist Makio Koudai and her 15-year-old niece Asa, who live together under one roof. Makio took Asa in on a sudden impulse after Asa's parents, which included Makio's older sister, passed away. The next day, Makio returns to her senses and remembers that she does not do well in the company of other people. So begins their daily life, as Makio attempts to acclimate to a roommate, while Asa attempts to get used to an adult who never acts like one.

Official: Shodensha (Feel Web, Shodensha), Mechacomic, Piccoma, Pixiv Comic

Note: Nominated for the Manga Taishou Award in 2019 and 2020 and the Tezuka Osamu Cultural Prize in 2024.