Ijiwaru Na Haha To Ane Ni Urareta Watashi. Naze Ka Wakagashira Ni Dekiaisaretemasu summary:

Sumire, who grew up being abused by her own mother and sister, was not allowed to go on to higher education, and all the money she earns from holding down jobs is taken away by the two spendthrifts. When she returned home, she was worked hard without a moment's rest, and the only solace she had was time to read books.Then one day, a yakuza gangster, claiming to be a young leader of the Shizuki clan, comes to collect on a debt his sister has incurred!Sumire, who was abandoned by her family, and Kiriya, who lives a life of a gangster - the clumsy duo interweave to create an exquisite Cinderella romance starts now!