Livingstone

At the beginning of the 20th century, an American doctor named Duncan MacDonald engaged in a series of unethical experiments. Those experiments concluded that should one suffer a death not ordained by fate the human body would lighten by an average of 30 grams, which is the weight of a person's "soul stone."

Sakurai and Amano are on a hunt to find people who are about to die before their time and either prevent their unnatural deaths or recover these stones, dubbed "livingstones."