10 years ago, the “Pandora Box” was found on Mars. On Earth, it created walls that divided Japan into Touto (Eastern Capital), Hokuto (Northern Capital) and Seito (Western Capital) and brought along the Smash, unidentified lifeforms that attack people. Sento Kiryu, a prodigy physicist, transforms into Kamen Rider Build to fight the Smash.
(Source : http://kamenrider.wikia.com)
Link Download :
Episode 1 – 25 => Google Drive
Episode 26 – 49 END => Google Drive