Sennyuu! Gakeppuchi Spy no Shakkinhensai RTA: Josou Maid to Oni Joushi

It is the Meiji period. To obtain the "Contract Seal", an debt-ridden spy must infiltrate the Mikage family, one of Japan's 3 major commercial groups, as a maid.
There, she meets a mysterious man, dressed in a maid uniform... In order to repay her father's debts, she carries out her mission, all while being rushed by her boss.
(Source: DLsite)