Hatsujou hanayome: Onedari wa ushiro kara(2011)

Takiko and Tefu are sisters who run a snack bar. Tefu's boyfriend proposes to her, but she puts off giving him an answer out of concern for Takiko. Furthermore, her brother Minoru, a gangster, also torments her. When Takiko finds out about Tefu's marriage plans, she accepts a mistress contract with Hoshino, a regular customer, in order to raise money, but...