Ryuga Banjo is the emotional core of Episode 1. He is arrested for the murder of his lover, Kasumi Ogura, a crime he did not commit. When we meet him, he is a coiled spring of anger—wrongfully imprisoned, betrayed by a system he doesn’t understand.
This isn’t just set dressing. The divided Japan functions as a prison and a Petri dish. The Smash (the monsters of the week) are not demons; they are citizens of Touto who have been abducted and subjected to “Nebula Gas” experiments by Faust, a shadowy organization. The horror is systemic: your neighbor could be turned into a rage-beast overnight. Sento’s battles are not just about saving people—they are about stabilizing a fragile cold war. When he transforms, he is literally a weapon that could tip the balance of power, which is why Touto’s government (through Misora and her father) is so eager to control him. Kamen Rider Build Tap 1
Episode 1 of Kamen Rider Build ends not with a celebration, but with a question. Sento stands over Kasumi’s remains, Ryuga punches a wall in grief, and the Night Rogue watches from the shadows. The title card appears: “They Are the Best Match.” Who? Sento and Ryuga? Or Sento and his own lost identity? Ryuga Banjo is the emotional core of Episode 1