The summer movie of Kamen Rider 555, shown alongside Bakuryuu Sentai Abaranger DELUXE Abare Summer Is Freezing Cold.
It is considered as a continuation of an alternate ending, where Smart Brain and the Orphnochs have won the war in the near Future and accomplished their goal of world domination, with 90% of Earth's population being Orphnochs while the human race is diminishing to near-extinction. Takumi Inui / Kamen Rider Faiz has gone missing and is presumed killed in an attack by Smart Brain's Riotroopers led by Leo / Kamen Rider Psyga. His friend Mari Sonoda leads a human resistance group to fight back against Smart Brain, attacking their headquarters to steal the top-secret "Emperor Belts". The Orphnochs Yuji Kiba, Naoya Kaido and Yuka Osada seek a peaceful coexistence between both Orphnochs and humans, but receive opposition from both humans and Smart Brain. Smart Brain's chief meanwhile seeks to find a user for Smart Brain's second Emperor's Belt, and is eyeing Kiba as a candidate.
The movie contains the following tropes:
- Alternate Continuity: "What If? the Orphnochs did rule the world?"
- Ambiguous Ending: The movie ends with a dying Kiba entrusting Takumi to fulfill his dream of peace between humans and Orphnochs. Takumi and Mari then walk out of the Smart Brain stadium together in search of a place to live as the credits roll.
- Brain in a Jar: Murakami in this movie is just a head in a jar full of liquid, having apparently lost his body at some point. It later receives an explanation in an S.I.C. Hero Story.
- Darker and Edgier: Even more bleak than the 555 TV show, in fact, this is the darkest and saddest movie in Kamen Rider history, with most of humanity having been exterminated while Orphnochs dominate the planet, and few on either side working towards any kind of peace, plus multiple deaths.
- Death by Adaptation: Naoya Kaido/Snake Orphnoch gets killed and eaten by the Elasmotherium Orphnoch, while he survives in the TV series.
- Despair Event Horizon: Kiba gets pushed over it after Yuka and Kaido are killed and he is made to believe Mari betrayed him, leading to him abandoning his ideals of peaceful coexistence between Orphnochs and joining Smart Brain, becoming their second rider, Kamen Rider Orga.
- Fake Memories: Takumi had false memories implanted in him by Mina's father, a former Smart Brain scientist, so Takumi would believe he was Mina's childhood friend and would care for her after he was gone.
- Fantastic Racism: Goes both ways between humans and Orphnochs. The Orphnochs seek to exterminate what remains of humanity and in turn many humans are distrustful of all Orphnochs, even good Orphnochs like Kiba.
- Foreshadowing: The movie depicts several events that would later occur in the TV series, namely Takumi's reveal as the Wolf Orphnoch and Kiba's FaceHeel Turn.
- La Résistance: What remains of humanity have formed a rebellion against Smart Brain and the Orphnoch regime.
- The Man Behind the Man: Smart Brain is shown as truly being run by three guys seen as blurry faces on hologram screens. All of them are played by longtime Toku Big Bad voice actors who've been menacing Riders and Rangers since The '70s. (One of them is Gorō Naya, which is really interesting, given the recent Word of God about every Naya-voiced "[Organization Name]'s Great Leader," no matter how different-looking from the last or or clearly dead by the end, being the same guy.)
- Monstrous Cannibalism: The Elasmotherium Orphnoch, which Smart Brain only seems to keep around as a tool of execution for humans or rebellious Orphnochs.
- Non-Serial Movie: The movie doesn't take place at any point in the TV series and instead depicts a Bad Future where the Orphnochs won.
- One Nation Under Copyright: Following the Orphnoch revolution, Smart Brain seem to have become the new world government.
- Rhino Rampage: The Elasmotherium Orphnoch rampages after being freed from its confinement, with Kiba/Orga as one of its victims.
- Sacrificial Lamb: Kusaka dies early on against Psyga to demonstrate the power of the Emperor's Belt.
- Surprisingly Good English: Leo/Kamen Rider Psyga, played by America-born Hongkong-based actor Peter Ho, speaks perfect English. According to legend his Japanese was so bad that the director told him to stick to English.
- What Happened to the Mouse?: For whatever reason, none of the Lucky Clover appear in this movie despite being major villains in the TV series, though Kitazaki does receive a Suspiciously Similar Substitute in the form of Leo/Kamen Rider Psyga.
- You Have Failed Me: Murakami is executed following the deaths of Psyga and Orga on order of the Wirepullers for the loss of the Emperor's Belts.
- Zombie Apocalypse: This movie shows the scenario of what if the Orphnochs took over 99.9% of the world. (The answer is, it sucks to be a human in that world, but the Orphnoch majority lives pretty much like we do.)