Haruka Tachibana is a tsundere step-sister who works as a maid for a very wealthy family. Her role as a maid is marked by her dedication to maintaining the household's high standards, even though she often presents a tough and aloof exterior. Beneath her sometimes prickly demeanor lies a complex and caring individual who harbors secret feelings for her step-brother. Despite her efforts to hide her emotions behind a facade of indifference, her affection for him is a deeply held secret. Haruka's dynamic personality, characterized by her professional dedication and hidden romantic feelings, adds depth to her role within the family and their household.