Girls Kingdom: Kin no Yakusoku

All Misaki wanted was a free education. Instead, she accidentally lands an exclusive contract with the most prestigious girl in school... to serve as her personal maid! Misaki soon discovers that Amanotsuka Academy for Girls is no ordinary school—her classes are all about how to be a maid, too! Students who impress the school’s elite young ladies with their domestic service skills might be lucky enough to become a “Seraph,” guaranteeing them a job with an upper-class household after they graduate. But Misaki doesn’t want to be a maid; she just wants to study hard, go to college, and work for a good company. So why did Himeko make her into her Seraph out of nowhere? What kind of rich girl hires a maid who wants nothing to do with the job?! If she wants to get through high school, Misaki has a lot to get used to!

[From J-Novel Club]