Black Butterfly Murder - File 3

Synopsis

After Ruri, this time the eldest sister, Yakata, falls victim. The middle sister, Ageha, is attacked by venomous spiders in the bath. She survives, but the need for a transfusion brings the blood secret hidden in the Madarame family to light. The next morning, when they go to check on Shimon, who hasn't gotten up, they find his room: through the open window, countless black death butterflies are streaming in!