Ace finds himself in trouble due to the Boost Mark II Buckle's side effects, but narrowly survives with Keiwa and Neon's help. Having witnessed what happened, Ziin becomes hurt before Ace tells him about his life.
Mysterious monsters appear to attack the city and a team of Kamen Riders is assembled to fight them in a competition. One of such riders is Ace Ukiyo who can transform into the fox-like Kamen Rider Geats.
Tsumuri points her Magnum Shooter 40X at Ace - and a gunshot rings out. Was Ace shot?. A world where everyone can be happy, just what is Ace's true wish? For that - we witness the end.
Keiwa's older sister, Sara has been kidnapped by a Knight Jyamato. Despite his injuries, Keiwa is re-motivated by Ace not to give up on saving Sara, while the latter apologize for using the former during its first round.
Refusing to allow Ace to be declared the winner of the "Conspiracy" tournament, Girori sets up a new final round where either Keiwa or Neon could win if one of them kills Ace.
Keiwa rejoins the DGP after new player Ittetsu Tanba voluntarily gives up his place in the tournament to him and becomes motivated to revive those who have died in previous DGPs.
When Michinaga enters the Jyamato Grand Prix, his best friend, Toru, who he thought was killed during a previous season, appears before him and, to his astonishment, asks to work together to make his dream come true.
Despite obtaining his new power and form, Ace fails to reach his mother and finds himself in a strange dimension where he is approached by mysterious man in a fox mask.