After the end of the civil war that tore apart Japan, the new governors of Touto, Hokuto and Seito work together to reunify the country. However, they are actually members of an extraterrestrial race called the "Blood Tribe" (the same species as Evolto), who assumed their government positions as part of a plan to destroy Earth as they have done to Mars and other planets before. Considering Sento Kiryū (Kamen Rider Build) a major threat to their plans, the Blood Tribe manipulates his friends and other civilians into attacking him. With even his close ally Ryūga Banjō (Kamen Rider Cross-Z) now against him, Sento must fight to survive and stop the Blood Tribe's plan from succeeding.
as Sento Kiryuu · Kamen Rider Build
as Ryuuga Banjou · Kamen Rider Cross-Z
as Misora Isurugi
as Kazumi Sawatari · Kamen Rider Grease
as Nariaki Utsumi
as Shinobu Katsuragi
as Takumi Katsuragi
as Mitsuomi Goubara · Zebra Lost Smash
as Ryouka Saiga · Scissors Lost Smash
as Kamen Rider Zi-O (voice) (uncredited)
as Evolto / Kamen Rider Evol (voice)
as Yuu Maihara
as Arata Maihara
as Citizen
as Newscaster
as Weathercaster
as Reporter
as Belnage (voice)
as Sawa Takigawa
as Gentoku Himuro · Kamen Rider Rogue
as Souichi Isurugi · Kamen Rider Evol
as Kengo Inou · Kamen Rider Blood
as Build Driver (voice) (uncredited)
as Sclash Driver (voice) (uncredited)
as Civilian
