The fate of the representative battle was left in the hands of Kamen Rider Build and Kamen Rider Rogue. Build is able to gain the advantage over Rogue thanks to Sento’s genius intellect. Build suddenly begins to completely overwhelm Rogue with his new RabbitRabbit Form! However, all the data regarding RabbitRabbit Form made its way to Seito’s hands thanks to Sawa’s betrayal. Rogue slowly begins to devise ways to gain the upper hand on RabbitRabbit Form, as the fate of the battle suddenly changes. Furthermore, Sawa confesses to Sento and the others about her betrayal. What will become of Sawa now?