Officer Inokawa checks everyone's alibis for the time Ruri's body was placed on the butterfly grave and only Miyama has no alibi, so he is taken in for questioning. Yamano Katsunori sees a Black Butterfly and tells the fearful story of a woman whose husband was killed by the village head's son who then took her as his wife. She bore three beautiful girls, but they all suicided and she placed a curse on the village...