Meanwhile, their adversaries grow stronger and more numerous as they rally their forces.
While they slowly mature as a team, Issei will once again find himself in intimate situations with the girls of the Occult Research Club. As a result, she and Azazel lead the club on an intense training regime in the Underworld to prepare them for the challenges that lie ahead. After their fight with Issei’s sworn enemy, Vali and the Chaos Brigade, it is clear just how inexperienced Rias Gremory's team is. The Red Dragon Emperor, Issei Hyoudou, and the Occult Research Club are back in action as summer break comes for the students of Kuoh Academy.