A series of "Black Cases" has occurred in which people who have committed crimes in the real world have gone missing. It appears to be the work of the Punish Gore Nightmare, who metes out divine punishment to sinners.
Even if they are sinners, this is going too far! Nox joins Baku in his attempt to stop the Nightmare's rampage. Facing their most formidable enemy, the two transform into Zeztz and Rider Nox!