Doukyuusei MeidoClassmate Maid; 同級生メイド; Doukyuusei Meido; Горничная-одноклассница; Mi compañera de clase es una Criada; My Classmate is a Maid

A story about a girl sold off by her parents to a rich family to work as their live-in maid, to pay off debts. Unexpectedly, she finds herself working for her classmate's family... Note: the content rating jumps to Erotica starting at Chapter 21.