《Geats VS Revice VS 龙骑》冲击性的战斗现在开始。 作为假面骑士Revice“最后的故事”开始的第1部、Geats×Revice×龙骑的联动。 等待着被邀请参加Desire Grand Prix的浮世英寿们的是、被何人改变制作的新游戏「Desire Royale」。 暗中活动的谜之游戏管理员的策略,假面骑士之间的大激战! 谜之假面骑士登场、前所未有的混战游戏开幕……! 激战正酣,谁将成为最后赢家——然后赢家想要实现的愿望是什么。
Shipwreck survivors are found on Beiru Island (Infanto tô), which was previously used for atomic tests. The interior is amazingly free of radiation effects, and they believe that they were protected by a special juice that was given to them by the island's residents. A joint expedition of Rolisican and Japanese scientists explores Beiru and discovers many curious things, including two women only one foot (30 centimeters) high. Unscrupulous expedition leader Clark Nelson abducts the women and puts them in a vaudeville show. But their sweet singing contains a telepathic cry for help to Mothra, a gigantic moth that is worshiped as a deity by the island people. The giant monster heeds the call of the women and heads to Tokyo, wreaking destruction in its path.