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.

Bungo Stray Dogs the Movie: BEAST

Ryuga Dogai returns to investigate a new mystery - the theft of Makai Knights armour. Among the victims are Ryuga's old comrades from the Volcity crisis, Takeru and Aguri. The three will face off against an enemy previously though defeated - Zinga.