The third season of High School DxD. 
 
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. After their fight with Issei’s sworn enemy, Vali and the Chaos Brigade, it is clear just how inexperienced Rias Gremory's team is. 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. 
 
While they slowly mature as a team, Issei will once again find himself in intimate situations with the girls of the Occult Research Club. Meanwhile, their adversaries grow stronger and more numerous as they rally their forces. And with the sudden appearance of Loki, the Evil God of Norse Mythology, the stage is set for epic fights and wickedly powerful devils in High School DxD BorN! 
 
(Source: MAL Rewrite)

Hyodo Issei is a (perverted) high school boy. When he goes out on a date with his first girlfriend Asano Yuma, he is killed by her. Her true identity is Reinare, a fallen angel sent by a secret society Grigori to eliminate dangerous divine weapons. Issei is reincarnated as a devil by his senpai Rias Gremory, a Duke of Hell. Issei serves as Rias's low rank devil and fights against the fallen angels. 

Specials included with the Blu-ray/DVD volumes.

The devilish haremking Issei Hyoudou is back for more outrageous Oppai Battle Entertainment in the scintillating second season of High School DxD! Fans who like their hardcore action spiked with a double dose of fan service won't be able to pry their eyes off all the scorching supernatural schoolgirls waiting for them in Season Two. So what are you waiting for? Plant yourself in front of the boob tube and watch a harem of devil hotties show you how much fun it is to be bad! 
 
(Source: FUNimation) 
 
Episode 1 was previewed at a screening in United Cinema Toyosu, Tokyo on June 29, 2013. Regular broadcasting began on July 7, 2013. 
The Blu-ray and DVD Director's Cut includes an extra 3 minutes per episode.

Unaired anime episode bundled with the limited edition of High School DxD DX.2.

The fourth season of High School DxD. Issei and the 2nd years attend a class trip to Kyoto for well-deserved relaxation, leaving the senior and junior class students of the Gremory family behind. However, once there, they fall under attack and must win without Rias or their other powerhouses. (Source: Anime News Network) 
Includes episode 0, Taiikukan-ura no Holy.

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