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 | |||||
|---|---|---|---|---|---|
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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.
| Dazai, Chūya, Fifteen Years Old | |
| 26 · 27 · 28 | |
| Chūya Nakahara vs. Ryūrō Hirotsu Chūya Nakahara and Osamu Dazai vs. Arthur Rimbaud | |
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