Taking place between the events of Pokemon B/W and B2/W2, a hotshot trainer passing through the city of Driftveil decides to explore the Cold Storage room at the southernmost end of town, a building that has been abandoned ever since all the workers within it disappeared without a trace.
With a trainer from out of town now the latest victim of Driftveil's Cold Storage abductions, a group of guilt-ridden residents involved in some form with the debacle are forced to make a decision over how to deal with this mysterious threat, before word inevitably gets out.