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.
Asia moves into the Hyoudou residence and joins Issei’s class at Kuoh Academy to stay close to him. High School DxD Episode 6
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. Rias Gremory puts Issei through a rigorous physical
Issei attempts to fulfill devil contracts. After several failures—including a strange encounter with a man named Mil-tan—he successfully assists a foreigner named Susan with a love confession. Issei attempts to fulfill devil contracts
This episode concludes the "Excalibur of the Moonlit Schoolyard" arc with a massive revelation that reshapes the series' lore.
The rogue fallen angel Kokabiel reveals a devastating secret: both the Biblical God and the original four Satans died in the Great War. This revelation causes Asia to faint and Xenovia to face a crisis of faith.