Episode Title:
The Night Before Battle!.
Episode Description:
After watching a recording of the Rating Game between Sairaorg and Zephyrdor, the Occult Research Club are visited by Diodora Astaroth, who offers to trade Bishops but is rejected by Rias. Before leaving, Diodora attempts to court Asia again, and is stopped by Issei. He insults Issei by calling him a filthy Dragon, causing Asia to slap him. Diodora then announces that he will defeat Issei in the next Rating Game. On their way back from their client's request, Issei and Koneko are confronted by Vali and Kuroka who tells Issei to be careful of Diodora. Back at the Hyoudou Residence, heeding Irina's advice, the girls cosplay for Issei until a fight breaks out between Rias and Akeno. Issei then informs Rias about his encounter with Vali. At his house, Azazel is seen contacting Sirzechs, discussing Diodora's sudden increase in strength as they prepare for the worst case scenario. On the day of the Rating Game, Rias and her servants teleport to the Rating Game field while Azazel, Rossweisse, and Irina do the same secretly. At the Rating Game field, Rias notices the irregularity of the match, as a group of Devils starts to emerge from magic circles, revealed to be the Old Satan Faction with Diodora being in cahoots with them. Diodora then proceeds to kidnap Asia and carries her away, leaving the remaining Devils to dispose of the Gremory clan.
