Kamen Rider Build Episode 15

Sento succeeded in retrieving the Pandora Box from Blood Stalk, or Soichi Isurugi! But Gentoku Himuro immediately sends out a squadron to search the city for the Pandora Box. The words that Soichi told Sento still resonate within him... "Night Rogue is really Gentoku Himuro". In other words, Gentoku can use his position as prime minister to arrest Sento and the others, and harness the Pandora Box's energy as a weapon of mass destruction! With this, the fight between Build and Night Rogue for the Pandora Box begins... (Source: kamenrider.fandom)