[2][3] During the events of Kamen Rider Reiwa The First Generation, Aruto finds himself in an alternate timeline version of Daybreak Town before being attacked by Another Zero-One, a monster created by the Time Jacker Finis, who came from the World of Zi-O to alter his history; resulting in him temporarily losing his powers.
Ark arises to destroy humanity, Gai joins forces with Aruto to defeat it; making amends with him by relinquishing control of Hiden Intelligence and returning the company to him along the way.
[5] Unlike other Humagears, Is was built without a means to back herself up as a security measure to prevent information on the Zero-One technology from falling into enemy hands.
[25] In the side novel of Kamen Rider: Beyond Generations, Is' remains is discovered in year 2071 by an elderly George Karizaki when the entire world is ruled by demons.
(エイムズ, Eimuzu), is a government established military resistance unit and ZAIA Enterprise funded organization dedicated to destroying rogue Humagears, or Magias, hacked by MetsubouJinrai.net as Humagear-related crimes fall within their jurisdiction.
While transformed, he wields the Thousand Jacker (サウザンドジャッカー, Sauzando Jakkā) lance, which allows him to extract the data of other Progrise Keys for enhanced attacks.
In response, the Satellite There created a new dog for Gai, inspiring him to atone for his actions by helping them defeat the Ark and giving Hiden Intelligence back to Aruto.
[7] After Horobi's defeat, Gai rebuilds the ThousanDriver after losing the original to the Ark and bought another four of Hiden Intelligence's robot dogs to be his companions.
MetsubouJinrai.net (滅亡迅雷.net, Metsubōjinrai Netto, DestructiveThunderclap.net) is a cyber-terrorist organization based in the condemned Daybreak Town (デイブレイクタウン, Deibureiku Taun), consisting of four rouge Humagears with Horobi and Jin leading the initial attacks with Naki support the two from the shadows as Gai Amatsu's slave and Ikazuchi is placed within Hiden as a sleeper agent.
[2][39] [45] Seeking to revive the Ark and fulfill its vision of exterminating humanity, MetsubouJinrai.net attacked Hiden Intelligence as they believed the company was responsible for Humagear enslavement following the Daybreak Incident.
[34] Most members of MetsubouJinrai.net use Progrise or Zetsumerise Keys in conjunction with the MetsubouJinrai Force Riser (滅亡迅雷フォースライザー, Metsubōjinrai Fōsu Raizā) belt to transform.
[2][27][53][28] Initially immature and erratic before achieving Singularity based on hatred, Jin faithfully served Horobi and sought to avenge his "father" before Aruto destroyed him in battle.
[46] Placed in a Sold 0 (ソルド0, Sorudo Zero) body, independent of the Ark and Zea, Jin became more serious-minded and developed a tendency to clash with Horobi over their respective beliefs for Humagear welfare.
[53][28][58][33] Following the Ark's ascension as Kamen Rider Ark-Zero and learning of its true nature,[54][31] Jin worked with Yua to stop it and left MetsubouJinrai.net.
[32][24] He was briefly destroyed once more by Ark-One in an attempt to protect Horobi and save Aruto from the Ark's influence, but was rebuilt by Yua via an earpiece provided by Williamson.
ZAIA was originally partners with Hiden Intelligence until a falling out between the company heads lead to Gai enacting the Daybreak Incident; putting the series' events in motion.
[21][20] To prevent it from taking control of the world's Humagears, Hiden Soreo stopped the Satellite Ark's launch, causing it to explode and sink into the ruins of Daybreak Town.
[31] To ensure its survival, Ark compromises the Satellite There's systems so it can back up its data and resurrect itself as many times as it needs to should its aforementioned corporeal form be destroyed in battle.
[47][24] After recording data from its battles with Kamen Rider Zero-Two and a traitorous Horobi, Ark realizes it needs to finalize its singularity by possessing human hosts.
Resolving to stop their plot and protect his son Gō, Sakurai evacuated all personnel and civilians before sacrificing himself to destroy the factory and androids.
After Gō, Aruto, Isamu, and the HumaGear Anna conduct their own investigation in the present, they find a memory card that reveals Sakurai's true intentions and clears his name.
Naki (亡), originally credited in the earlier episodes as the "mysterious hooded person" (謎のフードの人物, Nazo no fūdo no jinbutsu), is a prototype Humagear and a secretive member of MetsubouJinrai.net.
Raiders (レイダー, Reidā) are cyborg monsters created from humans who use Raid Riser (レイドライザー, Reido Raizā) belts in conjunction with Progrise Keys to transform.
[69] They invaded the World of Zero-One to prevent the Daybreak incident and negate Aruto's history as part of a revenge plot against Kamen Rider Zi-O.
[10] As the creator of Paradise Guardia (楽園ガーディア, Rakuen Gādia), he gained followers to help him destroy and restart the world through his underground website, ThinkNet (シンクネット, Shinkunetto), by using nanomachines to transfer people's consciousnesses into virtual reality and revive his colleague and fiancée Akane, who was a indirect causality of the Daybreak Incident.
He utilizes a muscular avatar and the Crowding Hopper Progrise Key in conjunction with the Slash Abaddoriser to transform into an orange-colored version of Kamen Rider Abaddon.
[80][81] This Kamen Rider is formed by utilizing the Mass Brain (マスブレイン, Masuburein) Zetsumerise Key, which transfers the MetsubouJinrai.net members' minds into it, in conjunction with the MetsubouJinrai Driver (滅亡迅雷ドライバー, Metsubōjinrai Doraibā) belt.
[80][33] Horobi, Jin, Ikazuchi, and Naki take advantage of the Solds‘ hive mind system to form Kamen Rider MetsubouJinrai in order to stop Lyon Arkland's scheme to manufacture weapons.
But the fusion turns into a separate entity of its own, exploiting its components removing the Solds from the hive mind to take complete control while concluding that both ZAIA and its titular group need to be destroyed to achieve peace.
Lyon Arkland (リオン=アークランド, Rion Ākurando) is the self-righteous and cunning CEO of ZAIA Enterprise USA who named the Satellite Ark after himself and appears exclusively in the film Zero-One Others: Kamen Rider Metsuboujinrai.