After years of searching, Akutagawa has finally found his sister, Gin, and the mysterious man in black--Osamu Dazai. Breaking from his agency colleagues, he charges right through the front door, with no regard for the powerful skill users who bar his way. It seems both his sister and his revenge are close at hand, but will things turn out as he expects? Events unfold in unforeseen ways in this alternate world of Bungo Stray Dogs!