Osamu Dazai and the Dark Era
Dark Era Light Novel Cover
Vital statistics
Author Kafka Asagiri
Illustrator Sango Harukawa
Published on August 1, 2014 (JP)
October 29, 2019 (US)
Published by Kadokawa
Publication order
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Osamu Dazai's Entrance Exam Origin of the Detective Agency: Untold Story
Bungo Stray Dogs: Osamu Dazai and the Dark Era is the 2nd light novel of the series, mainly focusing on Osamu Dazai's past in Port Mafia and telling the reason behind him leaving the organization. Like the 1st light novel, Dark Era was adapted into the anime, filling in Episode 13 to Episode 16 of the series.

It consists of six chapters in total.


The story begin 4 years before. Sakunosuke Oda, a member of the Port Mafia with the lowest rank entered a bar in the middle of the night, meeting Dazai and Ango Sakaguchi inside. The three decided to have a chat while drinking, discarding the barrier that was their statuses in the underground organization.

Dazai insisted on taking a photograph of the three, saying that he felt there won't be any other time for them to take it.

After that day, Ango was declared missing. Sakunosuke Oda was summoned by the Boss, Ougai Mori to search for the missing spy.



  • Prologue
  • Chapter 1
  • Chapter 2
  • Chapter 3
  • Chapter 4
  • Epilogue

Involved Parties


  • The story became an collaboration event of Bungo Stray Dogs with Love Heaven (its developer is the same as the one who created Bungo Mayoi)
  • It also became a collaboration event of Eighteen : Dream World.



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