Bungo Stray Dogs, Vol. 1

Doppo Kunikida is an
idealist and a strait-laced detective at the Armed Detective Agency, an
organization 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 to
watch over the new guy, Osamu Dazai, a suspicious fellow of unknown origin who
is obsessed with the thought of suicide. While investigating an unusual case
involving a so-called haunted building, they find several of the missing people
from another investigation. However, before they can find out how these cases
connect, they are attacked by the mafia's Ryunosuke Akutagawa, sworn enemy of
the agency! This is the beginning of a hopelessly inseparable relationship
between two detectives. A battle of Abilities erupts in the shadows of
Yokohama!