Kotaro begins to realize the new power he has gained by becoming Kamen Rider Black RX, even as a robotic member of the Crisis Empire has him targeted for battle.
In order to save the son of the Sahara Family from a wind-controlling knight, Kotaro must travel to the Demon World where he discovers the truth about the realm of the Crisis Emperor.
When a childhood friend of his discovers plans for a massive Crisis poison gas weapon, Kotaro must come to his aid and protect him while preventing the plans from falling into the wrong hands.
A girl who suddenly becomes a genius becomes the target for the Crisis Empire due to a secret kept from her by her parents regarding who she really is.
Maribaron decides to use one of Gedorian's weaker monsters to assist in a plot to brainwash humanity by manipulating the purity of a cactus-loving girl.