What if the Port Mafia's Hellhound, Ryuunosuke Akutagawa, had joined the
Armed Detective Agency? Likewise, what if Atsushi Nakajima belonged to
the Port Mafia? In the parallel world of Bungo Stray Dogs: Beast,
fledgling detective Akutagawa's desperate mission to rescue his younger
sister from the Port Mafia's clutches brings him face-to-face with the
organization's fearsome White Reaper...a.k.a. Atsushi Nakajima. What
does fate have in store for the two beasts in this alternate tale of
darkness versus light...?