Diabolos of the Old School Building
Cover of High School DxD Volume 1 featuring Asia Argento, Issei Hyoudou, and Rias Gremory
Kana ハイスクールD×D1 旧校舎のディアボロス
Romaji Haisukūru Dī Dī 1: Kyūkōsha no Diaborosu
Air/Release Date September 20, 2008
ISBN 978-4-8291-3326-2
Manga Equivalent Volume 1, Chapter 1–Volume 2, Chapter 10
Anime Equivalent High School DxD (Season 1) Episodes 1–5
Next Phoenix of the Battle School

Diabolos of the Old School Building is the first novel of the High School DxD series. This novel covers the first half of the Red Dragon Emperor's Awakening arc.


The same colour as that person’s hair colour—.

That’s what I thought while I was looking at my hand covered in blood.

Red— A crimson red hair which is more brilliant than strawberry-blonde.

Yes, that person’s beautiful and long crimson hair has the same colour as the colour my hand is covered in.


I, Issei Hyoudou, am a second-year high school student but I'm not her age. She went out with me! It was bound to happen but why did she kill me!? Still, doesn't this world have a God!? The most beautiful girl in the school, Rias Gremory, saved someone like me. The truth hit me that it wasn't God or Buddha, but a girl who said she was a Devil. "You have been reincarnated as a Devil. Work for my sake!" The curtain was raised, thus my life as a Devil servant who was attracted to the award of my senior's tits began.


  • Life.0
  • Life.1: "I Quit Being Human."
  • Life.2: "I Start as a Devil."
  • Life.3: "I Made a Friend."
  • Life.4: "I'm Saving My Friend!"
  • New Life.
  • Afterword


Main Characters Other Characters Antagonists



  • Diabolos means "Devil".
  • Originally the first volume was meant only for Issei to be just a human who helps Asia. However, that kind of development would take many volumes to keep up (especially since Issei does not have any specific talents to begin with), so Ishibumi changed Issei to be a Devil and introduced Rias.
  • Ishibumi wrote the entire plot from the scene where Asia died and Issei prayed to God.




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