Världens starkaste superhjälte kan döda vem som helst med ett enda slag, men ett liv utan utmaningar gör honom uttråkad och deprimerad.

Atsushi Nakajima was kicked out of his orphanage, and now he has no place to go and no food. While he is standing by a river, on the brink of starvation, he rescues a man whimsically attempting suicide. That man is Osamu Dazai, and he and his partner Kunikida are members of a very special detective agency. They have supernatural powers and deal with cases that are too dangerous for the police or the military. They're tracking down a tiger that has appeared in the area recently, around the time Atsushi came to the area. The tiger seems to have a connection to Atsushi, and by the time the case is solved, it is clear that Atsushi's future will involve much more of Dazai and the rest of the detectives!

A journey that follows the Ganges from its source deep within the Himalayas through to the fertile Bengal delta, exploring the natural and spiritual worlds of this sacred river.