Reclusive novelist Makio Koudai has always preferred the company of books—but when her sister and brother-in-law pass away, Makio unexpectedly becomes the guardian of her 15-year-old niece, Asa Takumi. As they navigate grief, clashing personalities, and the challenges of living together, the two slowly open their hearts to each other, discovering warmth, understanding, and the meaning of family.
 
(Source: Crunchyroll)

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 that never acts like one.
 
(Source: Anime News Network)
 
Note: Includes five extra chapters.

Hattori