Himezoku ( 秘女族, Himezoku) are members of the Hime Clan that governs Amawakuni. Himezoku maidens stand in line for the throne to become the next Himeou for every 30-60 years, as only Amatsuriki is bestow to females, not males.
Since the very beginning, the universe of Amawakuni was created by Emperor of Hinowa the ruler of all Hayagami. When the emperor's time came to an end, his Hayagami--Tsukuyo--was left in perverse of the Hime Clan. Female Himezokus had since took charge of keeping the world organize in the emperor's absence. Until the reincarnation of the emperor makes his appearance, all Himezoku and Himeou will have the world stay intact.