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Progrise! Connection! (Connection!) Complete! MetsubouJinrai! Quartet with Unified Will!
~ Transformation Announcement

Kamen Rider MetsubouJinrai is the final antagonist of Kamen Rider Zero-One related media and its Zero-One Others movie duology.

They are the collective fusion between the MetsubouJinrai.NET core members (Horobi, Naki, Jin, and Ikazuchi) , accessed when all four members insert their own Massbrain Zetsumerisekey into each of their individual MetsubouJinrai Drivers. The transformation will immediately disable all four Humagears and materialize the Rider from thin-air.

Due to the nature of the Massbrain Zetsumerisekey, this form is uncontrollable as the fusion creates a singular entity with a unique personality that takes control over the body and quickly suppresses the minds of all four of its users.

They serve as the eponymous protagonist of Zero-One Others: Kamen Rider MetsubouJinrai, and will later serve as the main antagonist of Zero-One Others: Kamen Rider Vulcan & Valkyrie when the Massbrain Zetsumerisekey leads the collective entity to destroy their original selves and seek the extermination of both ZAIA Enterprise and their own faction.

It is voiced by Maynard Plant and Blaise Plant, who also voice the equipment in Kamen Rider Zero-One.


The Massbrain Zetsumerisekey and MetsubouJinrai Driver were created from a seemingly failed attempt by Lyon Arkland to enslave in the Massbrain network. The four members of the group use them to fuse into Kamen Rider MetsubouJinrai and defeat Lyon and his army of Solds, though they soon revert their transformation after before it can overwhelm them.

The four Riders would later resolve to become Kamen Rider MetsubouJinrai again and use its power to liberate the Solds from the Massbrain network. Not long after the Solds were freed however, MetsubouJinrai engulfed all four of the Riders' consciousnesses and deleted them, becoming its own being. Lyon Arkland became Kamen Rider ZAIA to fight it but was defeated and slain, dying satisfied at what he had brought about.

Concluding that peace could only be achieved if both ZAIA and MetsubouJinrai.NET were destroyed, Kamen Rider MetsubouJinrai used Horobi's katana to destroy the bodies of the four members before engulfing ZAIA Japan's headquarters in a massive explosion, reducing it to rubble.

Kamen Rider MetsubouJinrai is last seen in the ruins of ZAIA Japan's headquarters, where the trapped consciousness of members are grieving in their helpless situation.


Due to the Massbrain Zetsumerisekey creating a single central consciousness from the users linked to it, Kamen Rider MetsubouJinrai is its own individual with a unique personality, operating independently of any of its four users.

Despite being made from the four members of, none of their personality traits remain in MetsubouJinrai's mind. In fact, it is violently opposed to both the group it is named after and ZAIA Enterprise, to the point where one of its first actions upon being created is to destroy the bodies of's four members before killing Lyon Arkland himself. Additionally, this hatred appears to have manifested in the form of a savior complex, believing that mutual destruction of both groups will save the world, despite the extreme collateral damage it will inflict onto society in the process.



  • MetsubouJinrai Driver

Zetsumerise Keys

  • Massbrain Zetsumerisekey



           Kamen rider zero one logo.png Villains

Ark | Horobi | Naki | Jin | Ikazuchi | Little Assassin | Azu | Kamen Rider MetsubouJinrai
Magia: Berotha Magia | Kuehne Magia | Ekal Magia | Neohi Magia | Onycho Magia | Vicarya Magia | Gaeru Magia | Mammoth Magia | Dodo Magia | Arsino Magia | Trilobite Magia | Dodo Magia Chick

ZAIA Enterprise
Lyon Arkland | Gai Amatsu | Makio Nodachi | Masamitsu Yuto | Azu | Giger
A.I.M.S.: Yua Yaiba | Eida | Ono | Degawa | Shida | Eifuku | Ito
Raiders: Crushing Buffalo Raider | Splashing Whale Raider | Dynamiting Lion Raider | Storming Penguin Raider | Scouting Panda Raider | Battle Raiders
Solds: Sold9 | Sold20

S | Bell | Moore | Lugo | Buga | Kamen Rider Abaddon

Alternate Timeline
Finis | Will | Soreo Hiden | Battle Magia

Kuroto Dan | Masamune Dan