第一部分：假面骑士Decade ～完结篇～骑士大战终于开始，世界的破坏者Decade将假面骑士们逐一打败。夏海为了阻止士而和KIVA-LA订下契约，变身为假面骑士KIVA-LA与Decade展开战斗。最终，KIVA-LA一剑刺穿了Decade……各骑士的世界恢复了原样，但Decade的世界却消失了。哀伤的众骑士一起回忆与士并肩作战的日子，而此时，过去的士从各人的回忆中复活！另一方面，超级死神博士与佐鲁大佐、蜂女共同组建超修卡，并制造出Neo生命体杜拉斯……第二部分：假面骑士W ～Begins Night～鸣海侦探事务所这次受“风都”人气歌手安纱美所托，负责调查安纱美亡姐突然出现的不可思议事件。在调查过程中，已去世的前所长鸣海庄吉竟然出现在翔太郎他们的面前，并变身为假面骑士Skull与之战斗。在与庄吉战斗的时侯，翔太郎逐渐回忆起庄吉逝去的那一夜，也是他与菲利普共同成为W的那一夜……第三部分：MOVIE大战2010Decade与W命运般地相遇，并与全平成骑士一同对战超修卡的巨大要塞！
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