Dragon of Dragon.
After Asia disappears, Shalba Beelzebub, a devil, tells the Occult Research Club that he has killed Asia by sending her into the Dimensional Gap. Xenovia attempts to avenge Asia, but Shalba easily defeats her and kills Diodora when he mentions the New and Old Factions. Enraged by Asia's assumed demise, Issei activates his Juggernaut Drive. Meanwhile, Creuserey Asmodeus, another devil, attempts to battle Azazel and his Down Fall Dragon Spear but Sir Zechs intervenes and kills Creuserey. Using his Juggernaut Drive powers, Issei overpowers and "kills" Shalba with the "Longinus Smasher." Vali's team arrives and brings Asia back from the Dimensional Gap, much to Xenovia's happiness. Vali and Rias decide to work together to calm Issei's rage; Vali uses his own Juggernaut Drive to match Issei and drain away his aura as Rias reaches out to him to calm him down. The Occult Research Club, Vali's team and Orphis, who says that she has removed a curse from Issei, witness the arrival of Great Red before Issei collapses from exhaustion.