Douma is a spy, he usually spies on organization called “Demon Slayer corps” and he attacks them. Once, his boss, Muzan, called him to his office

When Douma walked in, Douma’s eyes widened; he saw Muzan sitting down on chair and...a human? A female human in white thigh high slit dress and the dress had cut from toe to hips on both of her sides, she had gold jewerly on as she was sitting on the part for hold hand next to Muzan. Muzan told Douma the girl is his new maid