Doppo Kunikida is anidealist and a strait-laced detective at the Armed Detective Agency, anorganization that takes on dangerous jobs that even the police won't handle.Everything in his life is progressing as planned until one day he's ordered towatch over the new guy, Osamu Dazai, a suspicious fellow of unknown origin whois obsessed with the thought of suicide. While investigating an unusual caseinvolving a so-called haunted building, they find several of the missing peoplefrom another investigation. However, before they can find out how these casesconnect, they are attacked by the mafia's Ryunosuke Akutagawa, sworn enemy ofthe agency! This is the beginning of a hopelessly inseparable relationshipbetween two detectives. A battle of Abilities erupts in the shadows ofYokohama!