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.

Armed Detective Agency members discuss the most suitable candidate for the second-in-command. Doppo Kunikida is carrying out official errands as planned in his diary as usual. Unexpectedly, a bomb-related incident occurs, challenging the ideals he has always upheld. When weighing one life over hundreds, how will he proceed?

It’s been roughly one year since Chuuya Nakahara joined the Port Mafia, and he’s determined to become an executive before fellow mafioso Osamu Dazai. However, a man by the name of Paul Verlaine—the king of assassins who claims to be Chuuya’s older brother—suddenly appears, vowing to murder everyone he cares about! Now Chuuya must team up with Adam, an AI investigator from Europe, to stop this madman before another storm engulfs Yokohama. Along the way, many truths will be revealed…including the answer to Chuuya’s most pressing question: Is he himself even human?

Not long after Ougai Mori takes the reins of the Port Mafia, his right-hand man, Osamu Dazai, has a nasty run-in with a gravity manipulator named Chuuya Nakahara, leader of the Sheep gang. However, with ominous rumors about Mori's deceased predecessor as well as the mysterious being called Arahabaki spreading throughout Yokohama, the duo must put aside their differences and get to the bottom of things. Before they achieved infamy as the fearsome pair Twin Dark, Dazai and Chuuya were just boys. Was their first encounter a harbinger of hope or an ill omen of things to come...?

To rescue his daughter, an unstable Special Forces veteran unleashes his inner beast as he pursues her kidnappers — and soon becomes a suspect himself.

Unorthodox but effective FBI veteran agent Charles Barker takes on a rookie partner, Ellis Dove. Barker trains Dove in a hard-edged, psychologically driven approach towards undercover work, where a moment's hesitation can lead to death. As the job takes its toll on Dove, an Internal Affairs team tries to enlist the rookie as a double-agent in the bureau's investigation of his partner.

Two rival detectives with different methods try to solve the murder of a missing girl after discovering her mutilated body in the tidelands of Incheon.

In the near future where emotions have become a threat, Gabrielle finally decides to purify her DNA in a machine that will immerse her in her past lives and rid her of any strong feelings. She then meets Louis and feels a powerful connection, as if she had known him forever.

A murder case involving a child victim occurs near the Han River. Jin-Soo, a detective whose life has been in shambles since his own daughter was kidnapped and killed, is assigned to this case. Obsessed with child-related cases since his own tragedy, Jin-Soo becomes deeply engrossed in the investigation. One day, Jin-Soo is approached by his high school classmate, a famous actress, who asks him to find her missing sister. As he investigates, he discovers disturbing connections between her and the child found by the Han River. Unsettling truths gradually begin to unravel.

An adulterous woman draws a meticulous plan to murder her husband with the help of her lover, a much younger man. Committed the crime, they move to a beautiful Mediterranean island where they remain hidden waiting for the insurance company pays the policy of her husband. Everything seems to go perfectly when suddenly, she thinks she has seen her husband in a supermarket