Natsuhiko Kyougoku is alive-when such unthinkable news reaches the Special Division for Unusual Powers, rookie agent Mizuki Tsujimura sets out to gather information. But when she and killer detective Yukito Ayatsuji meet up in secret, they're attacked by a mysterious group!

When a request flies in from the government enlisting the help of Yukito Ayatsuji, a top-ranked skill user and detective notorious for his deadly skill, and Mizuki Tsujimura, a devoted newbie agent from the Special Ability Agency, the unusual duo find themselves with more than just an open-and-shut case on their hands...A must-read spin-off for all fans of the popular Bungo Stray Dogs series!