In this commemorative film, "Kamen Rider" series, which has been running since 1971, embarks on its next 50 years of battles set in three different eras: 1971, 2021, and 2071. The year is 1971, when Shocker, an evil secret society that wants to take over the world, created the "Kamen Rider"; the year is 2021, when the Deadmans, an organization that creates demons from humans, is in the dark; and the year is 2071, when the demons have completely taken control of humans and despair is swirling. An epic story unfolds in these three time periods.