This episode concludes the "Excalibur of the Moonlit Schoolyard" arc with a massive revelation that reshapes the series' lore.
Just as the battle with Kokabiel reaches its peak, Vali Lucifer (the White Dragon Emperor) appears, effortlessly defeats Kokabiel, and takes him back to the Underworld. High School DxD Episode 6
Rias Gremory puts Issei through a rigorous physical training regimen to increase his base stamina, as his "Boosted Gear" relies heavily on his physical health. This episode concludes the "Excalibur of the Moonlit