Touko and Hisae Asou are sisters with a "queen" and "slave" relationship. The older sister, Touko, has the beauty and talent that everyone envy and is currently the president of a company. Despite looking perfect, Touko has another side which she only exposes to her younger sister. Hisae, on the other hand, only sees the reason for her existence when she is with her older sister. However, the relationship between the two sisters starts to sway after Touko fell in love with a man.