Fifteen Arc

Fifteen Arc is the first background arc of Bungo Stray Dogs. It tells the story of how Dazai met Chūya, and eventually joins Port Mafia.

Summary

The ghost of the previous boss haunts the Port Mafia. At fifteen, Osamu Dazai, under the careful eye of Ōgai Mori, receives his first mission to investigate the matter. The investigation leads him to Chūya Nakahara, the infamous "King of the Sheep", a rival group of juveniles. With his own past unknown to him, and the lives of Sheep members on the line thanks to the Port Mafia, Chūya agrees to work alongside Dazai in order to unveil the truth behind the Port Mafia's former boss.

Appearances

Characters

Arthur Rimbaud†

Chūya Nakahara

Kōyō Ozaki

Kyūsaku Yumeno

Ōgai Mori

Osamu Dazai

Ryūrō Hirotsu

Shirase

Yuan

Chapters

From the Dazai, Chūya, Fifteen Years Old novel

Prologue
Phase. 01
Phase. 02
Phase. 03
Phase. xx
Phase. 04
Phase. 05
Epilogue

Episodes

Episode 26 - Dazai, Chūya, Fifteen Years Old
Episode 27 - The God of Fire
Episode 28 - Only a Diamond Can Polish a Diamond

Battles

Participants	Result
Chūya Nakahara vs. an unknown Port Mafia member	Chūya kills the man
Chūya Nakahara vs. Ryūrō Hirotsu	Chūya gains the upper hand until the previous boss appears and causes an explosion
Chūya Nakahara vs. GSS soldiers	Chūya kills all the soldiers
Chūya Nakahara vs. Arthur Rimbaud	Chūya defeats the man and kills him
Osamu Dazai vs. the previous boss	Dazai nullifies Randou's Ability, making the boss disappear
Chūya Nakahara vs. Shirase	Shirase stabs Chūya in the stomach with a poisoned knife
Chūya Nakahara vs. Sheep members and GSS soldiers	Chūya uses his Ability to create a hole in the ground and hide himself
Port Mafia soldiers vs. Sheep members and GSS soldiers	Dazai orders the Port Mafia soldiers not to kill the Sheep members as they are mostly children

Impact

Chūya joined the Port Mafia and left Sheep.
Arthur Rimbaud dies.

Fifteen Arc
Chapters	Dazai, Chūya, Fifteen Years Old
Episodes	26 · 27 · 28
Battles and Events