Kamen Rider Build the Movie: Be the One Episode 1

After the civil war that tore apart the regions of Touto Hokuto and Seito the new governors of each region work together to reunify Japan. In reality however they are part of an organization called Blood Tribe which intends to take over the entire world. Considering Sento KiryuKamen Rider Build as a major threat against their plans the Blood Tribe begins ...