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Villains Wiki
Villains Wiki

Smart Brain is the company that manufactures the Rider Gears and the main antagonist faction of Kamen Rider 555. Secretly, they are a front for a group of Orphnochs that see themselves as the master race and seek to increase the Orphnoch population as well as wipe out the entire human race. By the start of the series, they have gained a global monopoly on most electronic and vehicle trade. They are the largest coordinated group of Orphnoch seen in the series.

In the movie Kamen Rider 555: Paradise Lost they seem to have formed a world government following the Orphnoch revolution and use their army of Riotroopers to wipe out any remaining humans.


Kamen Rider 555

Smart Brain was originally run by Hanagata until he was ousted by Kyoji Murakami so he could seize control of the company and turn it into a front for the Orphnochs' genocide of humanity. Hanagata later managed to reclaim his company from Murakami and gave it to Yuji Kiba. However, having lost his faith in humanity after the death of Yuka, Kiba begins working to awaken the Arch Orphnoch, though he eventually regains his senses and fights alongside Faiz to bring the Arch Orphnoch down.

Kamen Rider 555: Paradise Lost

In the alternate conclusion shown in this movie, Smart Brain has become the dominant world power following the Orphnoch revolution and genocide of humanity, with squads of Smart Brain's Riotroopers now working to eliminate any surviving humans.




  • Kamen Rider Gaim director Ryuta Tasaki noted in an interview with Uchusen magazine that the Yggdrasill Corporation is a homage to Smart Brain, one of several references to past Heisei Rider series in the show.


           Faiz Logo.png Villains

Smart Brain
Kyoji Murakami | Smart Lady | Eiichi Toda | Yuji Kiba | Riotroopers

Lucky Clover
Kitazaki | Saeko Kageyama | Itsuro Takuma | Mr. J | Aki Sawada

Stingfish Orphnoch | Elephant Orphnoch | Ox Orphnoch | Mantis Orphnoch | Cactus Orphnoch | Owl Orphnoch | Scarab Orphnoch | Snail Orphnoch | Equisetum Orphnoch | Flyingfish Orphnoch | Armadillo Orphnoch | Toadstool Orphnoch | Scorpion Orphnoch | Worm Orphnoch | Sea Cucumber Orphnoch | Rabbit Orphnoch | Frog Orphnoch | Stinkbug Orphnoch | Swordfish Orphnoch | Rhinoceros Beetle Orphnoch | Stag Beetle Orphnoch | Octopus Orphnoch | Pigeon Orphnoch | Barnacle Orphnoch | Okra Orphnoch | Sloth Orphnoch | Frilled Lizard Orphnoch | Bat Orphnoch | Coral Orphnoch | Arch Orphnoch

Masahiko Minami | Masato Kusaka | Naoya Kaido

Leo | Butterfly Orphnoch | Longhorn Orphnoch | Giraffe Orphnoch | Pelican Orphnoch | Wild Boar Orphnoch | Slug Orphnoch | Mole Orphnoch | Moose Orphnoch | Lion Orphnoch | Elasmotherium Orphnoch | Mizuhara | Wirepullers of Smart Brain