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.
Akari Saito was born in Tokyo, Japan. She started her career in 2011, in the NHK TV show "R no hôsoku", and appears in various TV shows since then (she is known as being one of the "King's brunch" girls). She is primarily working as a stage actress since 2015.