潜伏的怪物威胁、异世界的怪物，砂糖人。人们并不知道，它们已经秘密进入了人间界。人们也不知道，它们正袭击和绑架人类。

为了保护人类，一位青年挺身而出！那是一位非常喜欢吃东西的青年——生真。通过吃下糖果，生真能创造出成为其眷属的存在「饱藏」，并获得变身为假面骑士的力量。现在，生真为了保护人们的幸福而与砂糖人战斗的故事开始了！

潛伏的怪物威脅、異世界的怪物，砂糖人。人們並不知道，它們已經秘密進入了人間界。人們也不知道，它們正襲擊和綁架人類。

為了保護人類，一位青年挺身而出！那是一位非常喜歡吃東西的青年——生真。通過吃下糖果，生真能創造出成為其眷屬的存在「飽藏」，並獲得變身為假面騎士的力量。現在，生真為了保護人們的幸福而與砂糖人戰鬥的故事開始了！

Granutes are intelligent lifeforms that operate secretly in the human world. They kidnap people for the sake of "Black Market Sweets." As people are attacked one after another by the Granutes, Shoma, a young man from another world, rises up to save the people. Together with the Gochizo, small monsters born from eating sweets, he transforms into Kamen Rider Gavv with a mouth-like belt!

Granutes são uma forma de vida inteligente que opera secretamente no mundo humano. Eles sequestram pessoas em busca de "Doces do Mercado Negro". Enquanto as pessoas são atacadas uma após a outra pelos Granutes, Shoma, um jovem de outro mundo, se levanta para salvar as pessoas. Junto com os Gochizo, pequenos monstros nascidos de comer doces, ele se transforma em Kamen Rider Gavv com um cinto parecido com uma boca!.