At the same time, a mysterious transparent wall appears and separates the two siblings. A monster known as the Jamato appears in the area and attacks Keiwa and other unlucky people trapped inside the area. Keiwa also runs away from Neon, who was streaming in the area. Just what in the world had happened? Then, Ace Ukiyo appears in front of the two, and approaches the Jamato...
[Episode summary from Kamen Rider Wiki]