DN GN 2 - The twin killer [In Revision Process]

June 2008. A string of unusual murders begins-detectives and journalists, all dead within ten days. The world's number one detective is called to unravel a case that grows stranger with every clue. By his side are the teenage sisters, Marina and Helen, along with the sharp agent Naomi Misora and the well-meaning policeman Momota Matsuda. As the investigation deepens, strange shifts in the weather add to the chaos-unpredictable and extreme, just like the case itself.

Perhaps things aren't as simple as they thought. Perhaps someone or something from the past will emerge, waiting for the right moment to finally appear as a protagonist and not as a supernumerary...