It's September 2018, and Myokoin Geiz is gearing up for his next big judo tournament. His friends Sougo and Tsukuyomi are by his side to cheer him on, as are fellow students Heure and Ora. But when Geiz suffers a career-ending injury during the tournament, he's forced to give up his dreams of becoming a champion. At the same time, Geiz is also approached by White Woz - who presents him with a RideWatch and Driver, urging him to become a saviour once more.
Crossing paths with Riders from across history as well as the world-hopping treasure sniper Daiki Kaito, Geiz slowly inches closer to taking up the mantle of a Kamen Rider once more. Why are White Woz and Diend here? And why is Geiz being told that his best friend is destined to become a ruthless overlord?