Showa Year 5, Yokohama. There are bizarre serial murders targeting only women happening all over town, and the citizens are in mass panic. Among them, there is a lonely, orphaned girl named Kouzuki Elena, who received a transfer to the prestigious "Ieva Girls School" and came to this city with her chest filled with hope. Elena and the “men” around her had no idea that this would mark the beginning of a series of events that would engulf them all.