Kicked out of his orphanage and on the verge of starving to death, Nakajima Atsushi meets some strange men. One of them, Dazai Osamu, is a suicidal man attempting to drown himself in broad daylight. The other, bespectacled Kunikida Doppo, nervously stands by flipping through a notepad. Both are members of the "Armed Detective Agency" said to solve incidents that even the military and police won't touch. Atsushi ends up accompanying them on a mission to eliminate a man-eating tiger that's been terrorizing the population...

[Source: Crunchyroll]