Nami and Taichi are university underclassman and upperclassman. During a mountain climb together, they confirmed their feelings for each other and started dating. Perhaps due to their high spirits, they got lost on the way down and arrived at a certain mountain lodge. Since it was before sunset, they were allowed to stay overnight, but... The lodge managers were beast-like men who, unbelievably, began to toy with Nami right in front of Taichi's eyes. Taichi, who had only ever kissed her, was filled with despair. Meanwhile, Nami's masochistic tendencies were exposed, and she began to feel pleasure while being pinned down...