A mysterious blader suddenly appears before a persona who has reached the pinnacle of power. She shows enough skill to hold her own against Masked X, but her true identity is said to be the sister of Kurosu Ex. She has come to inform Nine that the Kurosu family is putting the X City professional system at risk of extinction, but what are Nine's true intentions?

She is well-versed in Cross Corporation's futuristic technology and is also a qualified Beycrafter.