High School DxD is an anime series adapted from the light novels of Ichiei Ishibumi and illustrated by Miyama-Zero with forty-eight episodes.
Of these, three are considered to be “filler” or short breaks in between arcs for story development purposes. No need to worry about missing anything important!
Issei Hyodo was a second-year student at Gremory High School. He had just finished his first date ever and it ended with him being killed by an entitled girl who felt she should have been dating Issei instead of her boyfriend since he’s prettier than the guy himself! Luckily for Issei, this wasn’t some minor inconvience. Things couldn’t be any worse: afterlife demons don’t come back from death unless given permission or ordered by their masters (both situations where I would say ‘yes’). As underling to Rias Gremory, high-level demonoid beauty queen supreme has made sure all will go well on earth, at least until next year when finals roll around again.
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Episode
Type
Airdate
1
1
I Got a Girlfriend!
Canon
January 6, 2012
2
2
I'm Done Being Human!
Canon
January 13, 2012
3
3
I Made a Friend!
Canon
January 20, 2012
4
4
I'm Saving My Friend!
Canon
January 27, 2012
5
5
I Will Defeat My Ex-girlfriend!
Canon
February 3, 2012
6
6
I Work as a Devil!
Canon
February 10, 2012
7
7
I Get a Familiar!
Canon
February 17, 2012
8
8
I Pick a Fight!
Canon
February 24, 2012
9
9
I've Begun My Training!
Canon
March 2, 2012
10
10
The Showdown Begins!
Canon
March 9, 2012
11
11
The Acclaimed Battle Continues!
Canon
March 16, 2012
12
12
I'm Here to Keep My Promise!
Canon
March 23, 2012
13
13
Another Disquieting Premonition!
Canon
July 7, 2013
14
14
The Holy Sword Is Here!
Canon
July 14, 2013
15
15
I'll Destroy the Holy Sword!
Canon
July 21, 2013
16
16
A Strong Enemy Appeared!
Canon
July 28, 2013
17
17
Decisive Battle at Kuoh Academy!
Canon
August 4, 2013
18
18
Go! Occult Research Club!
Canon
August 11, 2013
19
19
Summer! Bathing Suits! I'm in Trouble!
Canon
August 18, 2013
20
20
Open House Begins!
Canon
August 25, 2013
21
21
I Have a Junior!
Canon
September 1, 2013
22
22
Various Three-way Deadlocks!
Canon
September 8, 2013
23
23
The Leaders' Summit Begins!
Canon
September 15, 2013
24
24
Clash of the Twin Sky Dragons!
Canon
September 22, 2013
25
25
Summer Break! Off to the Underworld!
Canon
April 4, 2015
26
26
Young Devils Gather!
Canon
April 11, 2015
27
27
Cat and Dragon!
Canon
April 18, 2015
28
28
Interception, Commence!
Canon
April 25, 2015
29
29
The Last Day of Summer Break!
Mixed
May 2, 2015
30
30
Second Trimester has Started!
Canon
May 9, 2015
31
31
The Night Before Battle!
Canon
May 16, 2015
32
32
We Will Save Asia!
Canon
May 23, 2015
33
33
Dragon of Dragon
Mixed
May 30, 2015
34
34
The Occult Club Disappears?!
Filler
June 6, 2015
35
35
I Will Fight!
Filler
June 13, 2015
36
36
Any Time, For All Time!
Filler
June 20, 2015
37
37
That's Right, Let's Go to Kyoto
Canon
April 17, 2018
38
38
School Trip, an Abrupt Attack
Canon
April 24, 2018
39
39
The Party of Heroes
Canon
May 1, 2018
40
40
Showdown! Gremory Family vs. Hero Faction in Kyoto
Canon
May 8, 2018
41
41
My Potential Released!
Canon
May 15, 2018
42
42
The School Trip is in Pandemonium
Canon
May 22, 2018
43
43
We are Preparing for the School Festival!
Canon
May 29, 2018
44
44
A Girl's Heart is Complicated
Canon
June 5, 2018
45
45
The Deciding Battle of the Strongest Youth, Begins!