After losing her mother at a young age and with her father disappearing due to insurmountable debts, Ruu Machida faces numerous hardships. With a strong determination to survive, she accepts a live-in maid job in a luxurious household, unaware that the family has three charming brothers, one of whom she recognizes. They offer her the job as their parents are frequently on business trips and with her hardworking nature, she becomes an indispensable help to the household. Over time, the brothers and Ruu develop a close bond, but not without challenges as Ruu has to handle her father's debts while dealing with the attention of three handsome suitors. The second volume of this story includes a one-shot called Watashi no Sugar Baby.