A series of mass disappearances have occurred again. Shoma, who had been busy with Ritsu's request, is suddenly joined by Hanto and Rakia. Rakia, who was involved in the previous mass disappearance, suspects Lango's presence in this case as well.
After receiving a report from the Gochizo, Shoma discovers Agents attacking people on a plane. He transforms into Gavv, but then Lango appears and delivers a powerful blow to him, knocking him out of his transformation. Hanto and Rakia, who rush to the scene, also transform into Riders and boldly confront Lango, but...!