It's been roughly one year since Chuuya Nakahara joined the Port Mafia, and he's determined to become an executive before fellow mafioso Osamu Dazai. However, a man by the name of Paul Verlaine--the king of assassins who claims to be Chuuya's older brother--suddenly appears, vowing to murder everyone he cares about! Now Chuuya must team up with Adam, an AI investigator from Europe, to stop this madman before another storm engulfs Yokohama. Along the...

"Seven years before the events of Bungo Stray Dogs, a young Osamu Dazai is ordered by Ougai Mori to investigate an ominous rumor--there have been sightings of Mori's deceased predecessor, and the new Mafia boss would very much like for the dead to stay buried. Along the way, Dazai runs into a gravity manipulator named Chuuya Nakahara, leader of the teenage Sheep gang. Together, the two will one day achieve infamy as the fearsome duo Twin Dark, but...