A school was built on one of the Gates of Hell, behind which hordes of demons await the moment they will be free to roam the Earth. Hiruko is a goblin sent to Earth on a reconnaissance mission. He beheads students in order to assemble their heads on the demons' spider-like bodies. Hieda, an archaeology professor, and Masao, a haunted student, investigate the gory deaths.
Following the fall of Gorgom, Kotaro Minami tries to live a normal life with the Sahara family. However, this brief moment of peace is soon shattered by the arrival of the Crisis Empire—an evil alien menace that aims to eradicate humanity and claim dominion over Earth. After refusing to aid them in their nefarious goals, Kotaro is thrown hurtling back towards the planet with his transformation belt shattered. However, when he awakens, Kotaro discovers that the sun’s rays have blessed him with new power—the power of Kamen Rider Black RX!
Takeshi Hongo is a promising young man with a passion for motorcycle racing. However, his dreams are suddenly ruined when he gets kidnapped by Shocker, the evil secret organization planning to dominate the world. After being remodeled into a cyborg, Takeshi escapes and swears to protect the world from the inhuman monsters.
