Synopsis

Venturing into yet another Alternate Reality, Decade is immediately confronted by Kamen Rider Black. The Rider attacks relentlessly until Diend appears, summoning Femme to divert his attention. The following day, news of his location – the World of Black – and the realization that he must face the danger alone for Natsumi weigh heavily on him. Decade intercepts Guy, transforming into Ryuki to engage in battle. The fight escalates, culminating in Guy’s desperate use of a young girl as a hostage.