Aruto Hiden is a young man who just wants to make it as a comedian. However, he’s going to have to put his dream on hold as he’s been named his grandfather’s heir, and that means taking the presidency of the vast Hiden Corporation, which has revolutionised the world with its lifelike robot HumaGears. When evil forces begin to take over the HumaGears and turn them against humanity, Aruto must use his grandfather’s final invention to battle them as the first Rider of the new era, Kamen Rider Zero-One!