翔真とさちかの前に突如現れた謎の扉。扉に引きずり込まれた翔真は、闇スナックが存在しない平和な世界に辿り着く！？ そこにはハピパレがあり、ガヴを持つ青年タオリンが働いていた。しかし、タオリンには過去の記憶が全くなかった。翔真はタオリンの記憶を取り戻すため、力を貸す。一方、カリーズと名乗る男が町を無差別に襲撃し始め、平和な世界は一変する！ 平和を取り戻そうと奮闘する二人は、何かを掴もうとした巨大なお菓子の家へ辿り着くが、カリーズは正体不明のゴチゾウに変身し、翔真たちを追い詰める！ 最強の敵が手にした圧倒的な力の源とは？ 仮面ライダーガヴの時空を超えた大冒険が、今始まる！
A mysterious door suddenly appears in front of Shoma and Sachika. Shoma is pulled through the door and arrives in a peaceful world where illegal snack bars do not exist! There, he finds Happy Paradise, where a young man named Taorin, who has Gab, works. However, Taorin has no memory of the past. Shoma lends him his power in order to help Taorin regain his memories. Meanwhile, a man calling himself Currys begins indiscriminately attacking the town, and the peaceful world is turned upside down! Struggling to restore peace, the two arrive at a giant candy house, trying to grab something, but Currys transforms into an unidentified Gochizou and corners Shoma and the others! What is the source of the overwhelming power that this strongest enemy has obtained? Kamen Rider Gab's great adventure beyond time and space begins now!
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