"Ejected from the orphanage that had been his home, a despairing boy with no prospects in life named Atsushi Nakajima rescues a peculiar man from a suicide attempt-- Osamu Dazai. It turns out that Dazai is part of an armed-detective agency staffed by individuals whose supernatural powers take on a literary bent! When Nakajima is engaged by Dazai and his associate Kunikida to hunt down a man-eating tiger terrorizing the region, little does [he] suspect...

"Regaining consciousness after nearly losing his life to Akutagawa, Atsushi is paralyzed by the thought of inviting more death and destruction upon his companions at the Armed Detective Agency. But before he can make good on his vow to leave the agency, the Mafia sends Ryuurou Hirotsu -- of the merciless Black Lizard group -- to storm their offices! Between the Black Lizards and the bomb-tossing Motojirou Kajii, and the demure, kimono-wearing Kyouka...

"Their war with the Guild may be over--and the truce with the Port Mafia still stands--but the Armed Detective Agency remains as busy as ever, with both Atushi and Kunikida forced to confront their dangerous pasts. Soon, the agency is making contact with an ex-member to investigate the mysterious group that hacked into the Moby-Dick, but one can predict where this rabbit hole will lead ..."--Page 4 of cover.

"The Armed Detective Agency receives an anonymous request--and it's asking for Kyouka's help by name. But during her investigation with Atsushi, ex-Guild member Montgomery keeps mysteriously getting in their way! And as another old foe defies death while seeking a triumphant return, a newer enemy--the sinister Dostoyevsky--bares his fangs against both the Armed Detective Agency and the Port Mafia. Threatening to slowly but surely swallow the dark...

"With the heads of the Agency and the Port Mafia on the brink of death due to a 'cannibal' virus, the vicious rivalry between the groups rears its head once more! As the fearsome Akutagawa and the former assassin Kyouka face off in a fatal battle, a rare confrontation between the cocky Chuuya and genius detective Ranpo threatens to disrupt the city's peace. Meanwhile, Kunikida and Atsushi are off to search for a cure, but will they make it in time...

The American group of ability users known as the "Guild" appears, led by the wealthy Francis Scott Fitzgerald, who has his sights set on the Armed Detective Agency! Can Agency president Fukuzawa stop him...!? Not if Guild member Lucy Montgomery and can help it!

"Ryuunousuke Akutagawa pits his Rashomon against Nathaniel Hawthorne's The Scarlet Letter as the war between the Armed Detective Agency, the Guild, and the Port Mafia escalates. While each side tries to outwit and outflank the other, Chuuya Nakahara suddenly appears, ready to make a deal with the Agency. Can Nakahara's 'diplomacy' be trusted, or will he lead the Agency into even greater peril...?"--Page [4] of cover.