Nogami Neuro: Supernatural Detective: Butterflies Dance at the End of the World

Ten years ago, Eiji Sasazuka's entire family was brutally murdered by X (a suspected serial killer). At that time, he was wandering aimlessly from America to South America on his motorcycle, unable to forget the wide-open eyes of his dead sister . Meanwhile, in a certain town, he finds a butterfly with letters drawn on its wings , and as if possessed, he begins to pursue the ``mystery drawn on the butterfly's wings.'' The person who was drawing letters on the butterfly's wings was a Japanese-American girl named Emma. She carves the names of dead people on her butterflies and flies them in imitation of Asagi Madara , a butterfly that travels long distances.She was the only daughter of one of the local mafia's ``Natsume Familia''. Then, while Sasazuka is taken into the care of Familia, a murder occurs.