Kurohime - The Gate of the Clock - Prequel!

Seiya and his seven friends arrive at a campsite by the lake, but they get lost in the forest, and as if they are drawn to something, they arrive at a strange mansion, but the owner is invisible, and strange phenomena occur. The seven people begin to get anxious. Finally, the first victim appeared. A huge insect crawls on her female body. Raped by mysterious masked men