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!
Thousands of years after a mysterious phenomenon has turned everyone on earth to stone, dumb jock Taiju and super genius Senku find themselves revived in a world that has been taken over by the wilderness.
Zigg explains how Zi-O became lost in time.
Akane is despondent over the failure of her latest plan and stops sending kaiju to attack the city, leaving the Gridman Alliance to wonder what has happened.
Even though Yuta has lost his memories, he’s happy making new ones with his loving girlfriend Akane. Hey, wait a second…
Akane reveals to the Gridman Alliance that she’s been behind all the kaiju attacks, and warns them she’s going to destroy the upcoming school festival.
Yuta finally confronts Akane and her mysterious benefactor Alexis. Meanwhile, Anti continues to take matters into his own hands.