The year is 1937, and it has been six months since the Sendai Infantry left for Manchuria. The rotted corpse of a young woman is found at the bottom of a well, but her face and limbs are gone. The military police begin an investigation and search fervently for the person responsible, but they can't even determine the victim's identity, much less find any clues. However, the incident is made public when newspapers give wide coverage to the story, so Staff Sergeant Kosaka is dispatched from Tokyo to solve the case.