Tokyo is under attack by the evil Shocker organization, which is intent on capturing a girl named Mayu Tachibana. However, their plans are thwarted by Shocker Nova Co., Ltd. (ノバショッカー Noba Shokkā), a splinter group bent on conquering the global economy instead of just world domination. Takeru Tenkūji arrives on the scene and helps Mayu escape, but is overwhelmed by the Nova Shocker general Wolga before Takeshi Hongo appears and dispatches the Shocker Combatmen. Back at Daitenkū-ji, Takeru, Akari Tsukimura, and Onari learn of the history of Shocker, and Akari deduces that Mayu is from Jōnan University Affiliated High School based on her school uniform during the attack. To know more about Mayu, Takeru and Akari go undercover at the university as teachers. One day after school, Akari and Mayu are attacked by Shocker when Hongo once again intervenes and transforms into Kamen Rider 1. Following a brief reunion, Mayu slaps Hongo and runs away.
After a brief conversation with Takeru, Akari, Onari, and Makoto Fukami, Hongo goes to Mayu’s class the next day to lecture about the value of life. After school, Hongo and Mayu have a conversation, where Mayu is revealed to be the granddaughter of Hongo’s longtime friend Tobei Tachibana and she had held a grudge on Hongo for not looking after her for the past three years. The two mend their relationship as uncle and niece, despite Hongo’s financial burden. Meanwhile, Nova Shocker fires an electromagnetic pulse that causes a blackout and mass panic throughout the country while Shocker reveals that they need Mayu as a sacrificial lamb for their great leader, Ambassador Hell. Takeru and Makoto rush to the park to ask Hongo for his help in solving the blackout anomaly, but Mayu convinces Hongo to keep his promise to never fight again. Kamen Rider Ghost and Kamen Rider Specter arrive at Nova Shocker’s headquarters, but are once again overwhelmed by the generals Wolga, Eagla, and Buffal.
The next morning, Nova Shocker force the Prime Minister to sign a contract that binds the Japanese government with their organization in exchange for the restoration of electricity with their Nova Energy, only to cause mass power outages and pollution. Takeru, Akari, and Onari find Hongo by a log cabin to once again ask for his help, but Hongo has them do primitive chores instead. Hongo suddenly collapses, as years of fighting Shocker have taken their toll on his body. Mayu realizes that he did not abandon her, but traveled the world to protect it from Shocker. The cabin is attacked by Shocker, led by a revived Ambassador Hell. Hongo fends off against the Combatmen, but his body gives out as Ambassador Hell captures Mayu and prepares her for the sacrificial ritual. Ambassador Hell reveals that he was given the Eyecon of Alexander the Great and placed it in Mayu’s body for it to mature so he may wield its power. The ceremony is disrupted by Nova Shocker, ensuing a three-way battle between the Shocker groups and the Kamen Riders. The Alexander Eyecon is released from Mayu’s body, but is captured by Wolga. Hongo saves Mayu, but is mortally wounded by a shockwave emitted by Wolga’s new power. His body is cremated that night while Kamen Rider Ghost and Kamen Rider Specter battle Nova Shocker before a possessed Wolga slays Eagla. Hearing the cries of his niece, Hongo suddenly emerges from his fiery grave and goes to an old barn to pick up his Neo Cyclone. Takeru and Makoto, along with Ambassador Hell, are outmatched by Wolga and Buffal when Hongo suddenly rushes in to even the odds. With the help of Kamen Rider 1, Kamen Rider Ghost kills Buffal. Wolga mortally wounds Ambassador Hell, but the three Kamen Riders finish him off with their Rider Kicks. With his dying breath, Ambassador Hell destroys the Alexander Eyecon as Hongo rides off into the sunset.
Hongo returns by the cliffs to tell Takeru, Akari, Onari, and Mayu that he must once again leave Japan to continue his fight. Takeru tells him that he will always be his hero.
Original air date: March 26, 2016
Writer: Toshiki Inoue with Hiroshi Fujioka
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