Saigetsu, Mimei, and Tasogare of a mysterious organization appear before Houtaro and the others. The three, who say they are looking for a super weapon in this world, call in the Kasshine army to attack the people.

We will stop them! In front of Houtaro and the others, who are furious, Saigetsu and the others transform into Kamen Riders such as Dark Kiva! Houtaro, Rinne, and Supana also transform into Riders and stand up to them...!

Kaguya, who is reunited with Houtaro, comes to Furasu High School and charms the students with his "gorgeousness." Houtaro is taken aback by the notoriety that even a fan club has been formed.

Houtaro and Kaguya are again faced with the appearance of the Hundred's Kasshine army. Houtaro and the others transform into Riders and defeat them, but Kaguya utters ominous words about the leaders still being nearby...?!

Kaguya transforms into Legend and attacks Houtaro. Houtaro also transforms into Gotchard and fights back, but Kaguya shuts him down and says, "Gorgeous time is over," and leaves him alone.

They are supposed to have made up, but why? Houtaro and the others are puzzled by Kaguya's sudden change, but then a giant clock appears in the sky above them. What does the ticking of the clock mean? Moreover, the Dark King Gigist begins to act in secret...!?

Glion, transformed into Kamen Rider Eld by the power of the Philosopher's Stone, summons an army of Dreatroopers. The city and its people are transformed into gold, and El Dorado is steadily approaching completion.

Houtaro tells his mother, Tamami, that as a Kamen Rider he will create a future where humans and Chemies can live together, and that he doesn't want to run away from his Gotcha! He then joins Rinne, Supana, and the other Chemies in a final battle to defeat Glion!