In the early 20th century's Taishou era in Japan, Haru Asagi becomes a maid to aid her struggling family. Serving the influential Miyanomori family, she encounters the nation's top magnate and his six power-hungry sons. As the patriarch retires, the brothers clash for his position, fueled by years of rivalry and ambition. Amidst this turmoil, Haru navigates the complexities of each sibling's character, revealing their innermost traits. However, a looming threat threatens to unravel the family's legacy, putting everything at stake.