Cao Cao reveals that the Hero Faction, all of whom possess powerful Sacred Gears, kidnapped Yasaka, revealing that she would be the subject of a malicious experiment. He then requests that Issei and his group alongside Azazel engage in a battle against them. After using Boobylingual and Dress Break on three Hero Faction members, the team meet Siegfried, a devil purger and another member of the Hero Faction, who has three arms for each of his legendary swords...