After getting thrown out of an orphanage, young Nakajima Atsushi arrives in Yokohama just in time to interrupt the attempted suicide of Dazai Osamu. As it happens, Dazai belongs to the Armed Detective Agency – an organisation of individuals with extraordinary Abilities – and is presently looking for a man-eating tiger reported to be in the vicinity. Nakajima seems to have a connection to the beast, so Dazai drags him along to investigate the case... but then...! The stage is set In Yokohama for an action-packed literary jam session!