Ijiwaru na Haha to Ane ni Urareta Watashi. Naze ka Wakagashira ni Dekiaisaretemasu

Sumire was raised in a household where she was mistreated by her mother and sister. She was denied the opportunity for higher education, and any income she earned from working was taken by her family. Upon returning home, she was forced into hard labor with no time to rest, finding comfort only in reading. One day, a yakuza member from the Shizuki clan arrives to collect a debt owed by her sister. Sumire, who has been cast aside by her family, and Kiriya, a yakuza with a leadership role, begin to form a connection, leading to a romantic story.