Set in an alternative world of Bungo Stray Dogs, this "what-if" story imagines if Atsushi Nakajima was in the Port Mafia and Ryūnosuke Akutagawa was in the Armed Detective Agency, instead of vice-versa. The story follows Ryūnosuke Akutagawa, who vows revenge on a man dressed in black in order to rescue his sister. However, as he is about to starve to death, a man from the Armed Detective Agency appears.
Shouhei Hashimoto
Yuki Torigoe
Rui Tabuchi
Masashi Taniguchi
Ayaka Konno
Teruma
Nagae Ryoki
Kosuke Kuwano
Hitoshi Horinouchi
Ao Hirokawa
Akari Saito
Sakina Kuwae
Keisuke Ueda
Mitsu Murata
Yuta Kishimoto
Keisuke Minami
Hirofumi Araki