Nami and Taichi are junior and senior at university. While hiking together one day, they finally confess their feelings and begin dating. Excited and caught up in the moment, they lose their way on the trail and are forced to seek shelter at a mountain lodge. Before sunset, they ask the lodge's caretakers for permission to stay the night—but the caretakers turn out to be sinister men who proceed to torment and assault Nami right in front of Taichi. Having only ever shared a kiss until now, Taichi is shattered by shock and despair. Meanwhile, Nami harbors a secret masochistic side, and as she is overpowered and pinned down, she gradually begins to feel arousal rising within her.