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 "Sheep King", the Sheep being 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.

Chapters

 * From the Dazai, Chūya, Age Fifteen 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

Impact

 * Chūya joins the Port Mafia and leaves Sheep.
 * Arthur Rimbaud dies.