The 19-year-old Itsue is working her way through high school as a dominatrix, and is prone to plying her trade for physical punishment on her sisters when she gets angry. Her super power, the Earth Barrier Shield, is probably the most functional of all the sisters' inasmuch it enables her to generate a protective energy shield. In the one instance she is shown to use it, she focuses the ability through her whip, which she spins over her head, forming a dome. Her name comes from itsu (five) (for which another word is "go"), making her the 5th of the Sisters.

(Source: Wikipedia)