Other Title: 仮面ライダービルド-ハザードは止まらない, Kamen Raidā Birudo-Hazādo wa Tomaranai
Summary: Fighting with the forbidden item, the Hazard Trigger, has transformed
Sento into a dark version of Build, known as a “Hazard Form”. If he
continues to fight using the Hazard Trigger, according to Katsuragi’s
words, he will lose his sense of self. Sento is using the same
technology the enemy has been using on himself! But Build loses
consciousness during the fight. And then, Build stands before the Hokuto
Trio as he decides to finish his fight against them…