Yuri and Mio, childhood friends and best friends who attend the same university, had come to a mountain village in a certain prefecture for a trip. They stayed at a trendy, stylish campsite and tried to hike down the mountain instead of taking a vehicle, but they got lost in the unfamiliar mountains. While wandering, the two found a desolate guesthouse... but what lurked there were men like beasts, starving for women. They attacked the two young women with their healthy bodies and performed intense breeding in a gangbang with several companions. Eventually, Yuri and Mio's personalities collapsed, and they fell into becoming masochistic females.