"Perhaps the killer used the craft to kill his victims, or perhaps the craft was not the tool of the crime but merely the emblem he left at the scene to assert himself as an elegant killer whose puzzle no one could solve. Maybe the killer isn't present at all, and coincidence alone is the heroine of the whole story. But what's certain is that no one wished for all this conflict, these conflicting emotions, this worry, illusion, and insomnia. Yet, despite all that, everything happens against our will..."