High School DxD BorN returns with Issei Hyoudou, the Red Dragon Emperor, and the Occult Research Club as summer break begins at Kuoh Academy. However, Rias Gremory realizes her team's weaknesses after battling Vali and the Chaos Brigade. To improve their skills, Rias and Azazel lead the club in a rigorous training regimen in the Underworld. As the team grows and gains experience, Issei finds himself in compromising situations with the girls once again. Meanwhile, their enemies, led by Loki, the Evil God of Norse Mythology, continue to grow in strength. High School DxD BorN is poised for intense battles and powerful devils.