After casting Asia into the Dimensional Gap, Shalba Beelzebub kills Diodora for his failures. Distraught and enraged by Asia's demise, Issei's Juggernaut Drive is activated and he engages and kills Shalba in a duel. Unable to transform back after defeating Shalba due to the incomplete state of his transformation, Issei is stuck in his Juggernaut form...