For those searching for the beginning of Sento Kiryu’s journey, or for long-time fans looking to revisit the start of a modern classic, this analysis breaks down everything that made the first episode of Kamen Rider Build a masterclass in storytelling, suit acting, and world-building. Unlike many of its predecessors, Kamen Rider Build does not take place in a standard, recognizable modern Japan. Tap 1 immediately throws the viewer into a dystopian alternate history. We learn that a mysterious alien artifact, the Pandora Box, was discovered on Mars. During its transportation back to Earth, it was activated, creating the "Skywall"—three massive barriers that split Japan into three distinct regions: Touto (Eastern Capital), Hokuto (Northern Capital), and Seito (Western Capital).
His catchphrase, "Now, shall we begin the experiment?" isn't just a cool line; it defines his character arc. He treats his transformation not as a superpower he inherently possesses, but as a variable he must control and calculate. The antagonists of Kamen Rider Build Tap 1 are the "Smash." These monsters are not invaders Kamen Rider Build Tap 1
Tap 1 establishes Sento as a genius physicist with a snarky attitude and a sharp intellect. He wakes up with amnesia, saved by a cafe owner named Soichi Isurugi, and haunted by vague memories of a bat-like experimentation. Unlike previous Riders who might be athletes or ordinary students, Sento is a thinker. He solves problems with physics and chemistry, a trait that is woven directly into the show’s gimmickry. For those searching for the beginning of Sento
This political instability provides a backdrop of tension rarely seen in children's programming. In the opening minutes of Tap 1, we see not just a monster attack, but the geopolitical ramifications of a country torn apart. This grounding in "hard sci-fi" elements was a bold choice for the franchise, signaling that Build would be a series focused on logic, intrigue, and the consequences of power. The protagonist introduced in this episode is Sento Kiryu, portrayed brilliantly by Atsuhiro Inukai. When we first meet him, he is not a typical "hero by destiny" or a "hero by accident." He is a man searching for his identity. We learn that a mysterious alien artifact, the
The landscape of Japanese Tokusatsu changed forever on September 3, 2017. When Kamen Rider Ex-Aid concluded its vibrant, video-game-themed run, fans were introduced to a darker, more complex, and scientifically intriguing world. The premiere episode, officially titled "That One with the Best Match" (or simply referred to by fans as Kamen Rider Build Tap 1 ), marked the beginning of the nineteenth Heisei era Rider series.
