 Six years ago, Kurosaki's family was destroyed when a "shirosagi" (a "white swindler", who focuses on defrauding others) swindled Kurosaki's father of their family's life savings.As a result, his father killed Kurosaki's mother and sister before committing suicide.Since then, Kurosaki has devoted himself to becoming a "kurosagi" ("black swindler"), who swindles other swindlers, as a means of revenge.