Having been kicked out of the orphanage, a despairing young man by the name of Atsushi Nakajima rescues a strange man from a suicide attempt--Osamu Dazai. Turns out that Dazai is part of an armed-detective agency staffed by individuals whose supernatural powers take on a literary bent!
After rejecting an exclusive love call from the student council nice guy, gambling hotshot Mary Saotome has been attracting all sorts of unwanted attention-especially from her classmate and hater Kokoro Aiura, who tries to sabotage her every chance she gets. Can Mary beat the anti-fan at her own game and end the petty bullying once and for all?!
In the past, the actions of her Aunt Tsuguko, turn a young Yumeko’s life upside down. Love leads to deception and also the destruction of will. Endless risk and despair akin to pleasure. This is where Yumeko’s gambling obsession truly began!
All hope seems lost as the world teeters on the brink. With the forces of the agency scattered and One Order in the hands of Fukuchi, can Fukuzawa rise to his feet to strike down his dearest friend once and for all? And meanwhile, back in Meursault, Dazai and Dostoyevsky’s battle of wits appears to have come to a close…or has it? As Sigma sifts through the mysterious conjurer’s memories, he arrives at a shocking and terrifying truth!
Having defeated the middle school duo, Mary begins to plot her revenge on Yua Shishiba. But Shishiba wants revenge of her own, and decides to target Sachiko Juraku...Now, these three clash in a gamble prepared by Kirari herself!