Haruna and Shinji are close lovers. - After graduating from university and getting a job, Shinji proposed to Haruna on a trekking trip to commemorate his graduation. - Exhilarated, the two get lost and shipwrecked while descending the mountain. - She manages to reach a mountain hut, where she asks for help and ends up staying there, but the hungry men who keep coming to the mountain hut have no way of leaving the beautiful Haruna alone... - The two of them end up being surrounded by a mountain hut and spend their days in an endless hell.