Following Apollo Geist into another A.R. World, Decade is attacked by Kamen Rider Black until Diend arrives and summons Femme to hold him off. The next day, after learning that he is in the World of Black and seeing that he is on his own in saving Natsumi, Decade ambushes Guy as Ryuki and fights him until he uses a little girl as his hostage. When Decade takes a hit from Diend to save the child, Black watches and has second thoughts about him as Apollo Geist escapes. After explaining that Apollo Geist came to the world before and recruited the cult Gorgom into Dai-Shocker, Kotaro reveals that Joe the Haze ended up in his world and has been helping him fend off Dai-Shocker's endless army. Schwarian arrives and sends the Scorpion Imagin and Mantis Fangire after Decade and Black. Using Faiz's power, Decade destroys the two monsters as Schwarian summons the Chaps, allowing Tsukasa to make it back to World of Black RX as Apollo Geist summons a pack of Orphnoch and Worms. The numbers even ou