Legend has it that there was a village in the forest that disappeared during the day of memorial. This small village called Minakami Village once had a massacre, and when the villagers died, the village also disappeared from the map. However, it is said that people who have been lost in the mountains and forests for many years will be lured to this village...
During the summer vacation, the twin sisters Amakura Rei and Amakura Yu came to the forest where they had played together when they were children, hoping to leave one last memory before it was about to be built as a dam and disappear. However, sister Cocoon seemed to be possessed by something, and was attracted by a red butterfly and walked deep into the forest. Zero hurriedly chased after him, but what they finally arrived at was the legendary village...
There is no breath of life there, only evil spirits wandering around and resentment remaining in the space. And on that never-ending night of memorial service, the twins will be used as ritual sacrifices...
"The twins were originally one person, but they were divided into two at birth. When the twins merge into one, they will produce powerful power. The chosen witch will turn into a red butterfly and fly straight into the sky, calling for light, while the other witch will become the patron saint to protect the village..."
The bond between sisters, the sudden disappearance of the village, the mysterious ritual, the evil spirits wandering throughout the village, and the red butterfly shining faintly in the night sky...