Kamen Rider Build NEW WORLD: Kamen Rider Cross-Z is a post-series V-Cinema film of Kamen Rider Build. It will focus on the character of Ryuga Banjo, Kamen Rider Cross-Z, along with Kamen Rider Prime Rogue. It was announced immediately following the broadcast of the final episode of Kamen Rider Build. The film will have a limited theatrical release in Japanese theaters before its home video release. This is the last Kamen Rider movie to be released in the Heisei era.

The publication of a new dictionary titled The Great Passage progresses. Mitsuya Majime, originally from publisher Genbu Shobo's sales department, has been recruited by Kouhei Araki, a veteran editor of the dictionary department who is looking to retire soon. The dictionary department is known internally as the "money-eating insect," but Mitsuya uses his perseverance and attachment to the words in order to become a great editor. Mitsuya, who has poor social skills, finds himself working with another man named Masashi Nishioka, who is able to express himself better.

The stage is set in "another Japan" as a banquet of diverse superhumans unfolds... In an imaginary "age of gods" about 20 years after the war, Japan has grown and developed by leaps and bounds. What if all the superhumans ever written about in fictional stories existed at the same time? Superhumans who came into existence through different circumstances, and who are special in different ways—Titans from outer space, lifeforms from a mystical world, phantoms and goblins from ancient times, cyborgs created by scientists, relics that rose out of the ruins of ancient civilizations, and the list goes on. One segment of these superhumans makes no secret of their existence and has gained popularity in society. Others cloak their identities and fight in secrecy. There are enemies of superhumans as well, organizations that operate in the shadows. The Japanese government has taken many measures to secure peace and order. One is the establishment of an organization under the Ministry of Health and Welfare—the Overpopulation Research Laboratory, a.k.a. the Superhuman Bureau. Their mission is to identify and approach superhumans, then oversee and safeguard them. One member of the Superhuman Bureau, Jirou Hitoyoshi, is protagonist of this series.

In the crime-ridden, mafia-governed city of Ergastulum, Worick and Nicolas are two “handymen” known as “Benriya” who would take any dirty job from either police or mafia — for a good price. After an assignment from police the two met and later joined by Alex, a former prostitute who got interested in the mysterious background of the team, in particular of Nicolas’ abilities.

Toru Acura is a 20-year-old retired soldier meandering through life now that the war has ended. He encounters Chaika Trabant, a 14-year-old sorceress carrying a coffin, and follows her in hopes of finding meaning to his life again. The two travel with Toru's adopted sister, Akari, the employed member of the group and thus Toru's source of income.