Appearing in Japan once again, Doctor Reaper has a plan to destroy Japan by controlling a meteorite.

Someone reports the Shocker monster Garagaranda's strategy to poison the water supply to Masked Rider. The Shocker Chief detects Ambassador Hell is the traitor and decides to execute him.

With Ambassador Hell's defeat, Shocker's Japan division is abandoned. However the Shocker Chief adds the power of Africa's secret organization Geldam and forms the new organization Gel-Shocker.

Kamen Rider #1 is driven back by the Shocker Rider and the monster Haetoribachi's coordination and sinks under the sea with Haetoribachi.

Wih the Anti-Shocker Alliance's back up, the double Riders are able to escape danger and take Raydokuga prisoner. Moreover, to defeat Shocker Rider, they begin special training under Tobei's tutelage.

With the arrival of Masked Rider #2 Hongo is rescued and the Double Riders showdown against Leechameleon.

The hard-won peace obtained with the defeat of Gel-Shocker by Kamen Riders #1 and #2, is now shattered by a more powerful secret society known as Destron. Disposing of all those who witness their sinister movements, they target Shiro Kazami, a young motorcross racer. After Scissors Jaguar murders his family, Shiro vows vengeance and becomes Kamen Rider V3.

While Kazami Shiro recovers in a hospital, the Rider Scouts search for Destron's outpost, while Buzzsaw-Lizard tries to persuade Kawai to resuscitate Knife-Armadillo, under pain of death. Refusing, he now must witness the execution of his family. Captured by Destron, Shiro hangs over a pool of acid! Can he escape their trap and transform into V3?

Baron Fang resurrects Smilodon the sorceress and ancient mother of the Tusk Tribe in order to destroy the Kamen Riders. Taking on the name Ayanokoji she delivers a voodoo doll that poisons Hongo Takeshi who is taken to a hospital. When Kazami Shiro rushes to the scene she attacks him as Primordial-Tiger, who manages to subdue V3 and locks him up with Hongo. She then targets Ichimonji Hayato� can Hayato free his comrades and best Smilodon?

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The final battle between Black Sun and Shadow Moon comes to a bittersweet end as the final fate of Kotaro, Nobuhiko, and the Creation King is finally determined.

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Yuji Kiba leads a peaceful life until a truck hits his car, killing his parents and himself. Two years later, he awakens to find his life in ruins — his girlfriend Chie had left him for his cousin, and his house is gone. In rage, Yuji kills his cousin with his newfound powers. Meanwhile, Takumi follows Mari after realizing that they accidentally switched bags. However, the two are attacked by an Orphnoch. Mari attempts to use the Faiz belt to fight, but fails. She pushes Takumi to use it, and he defeats the Orphnoch.

Takumi still refuses to help Mari protect the Faiz Gear and leaves her when he finds that she has been lying to him about her wrist being hurt.

Keitaro and Takumi take Mari to the hospital after the battle with the Ox Orphenoch. Meanwhile, Akai, the Cactus Orphenoch, kills a fuel station attendant, much to the annoyance of his partner, Midorikawa.

Takumi, Keitaro and Mari go to see her father as he will know about the Orphenochs. Yuji takes Yuka to see someone who can help her.

While working in Keitaro's laundry business, Takumi burns some clothes. Mari believes that he is distracted due to what happened to his friend.