Nami and Taichi are juniors and seniors at university. While climbing a mountain together, they confirmed their feelings for each other and decided to go out together. Perhaps because they were excited, they got lost on the way down the mountain and arrived at a mountain lodge. Before sunset, the two were allowed to stay at the lodge, but... The lodge's caretakers were beast-like men, and they ended up toying with Nami right in front of Taichi. Taichi, who had only ever kissed Nami, was devastated. Meanwhile, Nami revealed her masochistic tendencies and began to feel aroused as she was pinned down...