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Seito (西都 Seito) is the western region of Japan in the World of Build, created as a result of the Sky Wall, and is led by Prime Minister Masakuni Mido. Its system of governing and political goals are based on economic recovery, doing so in one effort by sending its young adults across the world to gather technical knowledge. The capital's crest of Seito is a star with a grain of wheat looped around it.
Seito is made up of the islands of Shikoku, Kyushu, and western Honshu.
Its unit of currency is the Ruruku (ルルク).
In 2008, the INSET exploration vessel Prominence returned from Mars to Earth, carrying astronaut Soichi Isurugi and an artifact he found on the planet, the Pandora Box. What was not known then, however, was that Isurugi had been possessed by an alien entity named Evolto while on Mars.
To commemorate his return, a ceremony was held in Japan with numerous dignitaries in attendance. However, calamity struck when Isurugi, compelled by Evolto, attempted to activate the Pandora Box as it was presented. Though he was soon restrained by security, this interference caused the erection of the immense Sky Wall, which split the island nation of Japan into three.
While many lives were lost in what would become known as the Sky Wall Disaster, others who were exposed to the light of the Pandora Box found their minds warped to crave power. Among the afflicted was Masakuni Mido, who would establish himself as Prime Minister of Seito, one of three now seperate nations created by the Sky Wall Disaster. Also sharing his condition were Yoshiko Tajimi, who became Prime Minister of Hokuto, and Gentoku Himuro, who would become Deputy Prime Minister of Touto; the elder Prime Minister Taizan Himuro had not attended the event and so retained his mental faculties.
Seito initially stood as neutral when Hokuto invaded Touto. Eventually, however, Mido, knowing that the bulk of Hokuto's forces were engaged in Touto, sent Seito Guardians, led by the nation's own Kamen Rider, to seize Hokuto just as the proxy battle between Hokuto and Touto ended with the victory of Touto's Kamen Rider Build over Hokuto's Kamen Rider Grease. Sold out by Blood Stalk, Hokuto Prime Minister Yoshiko Tajimi was ordered taken into custody by Mido.
Mido followed up the subjugation of Hokuto by declaring war on Touto. Having been provided with the new Kaisers created by Nariaki Utsumi based on the system developed by Kaisei Mogami: Engine and Remocon Bro's, Mido presented Seito's fighting prowess in a message broadcast to the Touto government, presenting Seito's Guardians and Kaisers at the Sawatari Farm. Seito's Kaisers proved superior to both Hokuto's Hard Smashes as well as the Kamen Riders representing both Hokuto and Touto. They were second only to Seito's own Kamen Rider, Rogue, who made his way to Touto.
Having had Touto's government office bugged, Mido learnt from a conversation between Taizan Himuro and Sento Kiryu that, in light of Gentoku's new allegiance to Seito as Kamen Rider Rogue, they were planning to move the Pandora Box to a secure location. Before this could happen, Mido sent Gentoku to claim the Pandora Box for Seito.
- Masakuni Mido - First Prime Minister (Deceased)
- Juzaburo Namba - (disguise as Masakuni Mido after the real Masakuni's death, deceased)
- Mitsuomi Gohara - Governor, Zebra Lost Smash (Deceased)
- Gentoku Himuro - Kamen Rider Rogue, defected after betraying Touto, Faust, and Sento's team
- Washio Brothers
- Hard Guardians
- Kengo Ino - left to become governor to Touto, Kamen Rider Blood (Deceased)
- Ryoka Saiga - new governor
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