|This article is about a/an location in Kamen Rider Build.|
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Seito (西都 Seito) is the western region of Japan in Kamen Rider Build, created as a result of the Skywall, 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.