Kouta Kazuraba is taken into a new version of Zawame, where soccer teams aim to win the All Rider Cup. The reward: The Golden Fruit. Along with the City restored and the immense soccer popularity, he sees many things different from his world, such as Hase and especially Yuya still alive in this world. Though questioning why this is happening, there is a secret about the world. A strange man named Kougane starts sending locusts to other armored riders, consuming them, leaving their lockseeds intact in order to revive his Golden Lockseed, which in turn transforms him into Armored Rider Mars. Along with a strange youth named Lapis who seems to be in relation of the new world, will the Beat Riders be able to stop him?
因謎一樣的少年拿比素出現，澤芽市卻變成正在盛行足球活動並沉澱在狂歡氣氛之中，各方「Armored Rider」代表團隊「Team.鎧武」、「Team.巴隆」等因爭奪「黃金果實」的殊榮而於足球賽事「全騎士盃」上激烈競爭。
團隊之間不一樣的決鬥方式、沒有海姆冥界森林或異域者的威脅、甚至過往本已因不同事件而導致身亡的人卻仍然生存，種種跡象卻令葛葉紘汰 / 幪面超人鎧武泛起莫名其妙的不安。另外自稱為神的男人 － 光金 / 幪面超人馬魯斯開始實行殲滅所有「Armored Rider」的行動，令本來和平的日子開始產生變化。
