Rainbow Mask was in charge of protecting a fortress used by the Black Cross for their attacks, including a special "rainbow barrier" constructed to protect their property and men. With Sun Halo Mask leading, he partook in a scheme where the Gorengers were lured out, with four of them ambushed by Zolders disguised as EAGLE soldiers while Shinmei and Variblune attempted to attack the fortress on their own. After being greeted by Rainbow Mask in a vision, a grappling hook grabs Variblune forcing Aorenger to abandon it where he is soundly defeated by the Masked Monster. With the Gorenger's flying fortress in hand, Rainbow Mask and Sun Halo Mask use it to rampage through Tokyo, destroying power plants and other property.