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

Sumire was plain and unremarkable. Her extravagant and wasteful mother and sister forced her to handle everything, from earning money to managing the household, leaving her physically and mentally exhausted. One day, yakuza members showed up to collect her sister's debts... and instead of repayment, Sumire was sold to them. For some reason, Kiriya, the underboss of the yakuza, treated the dejected Sumire kindly. Later, seeing Sumire dressed up for work, Kiriya made a firm decision: "You don't have to work at the shop. Become my personal housekeeper." And so begins the clumsy, doting life of two people who eventually marry and find happiness, as they discover their place in the world! (Source: Kadokawa, translated)