In their fifth year of marriage, a couple struggles with the monotony of daily life. One day, the husband discovers that his boss secretly spied on his wife's underwear—and to his surprise, he feels intense arousal over the incident. This revelation awakens a new, hidden desire within him. After finding an unusual inn online called "The Mansion of Cuckolding," he decides to take his wife there. What kind of experience awaits them? Driven by restless excitement and obsession, the husband embarks on this journey, desperate to uncover what lies ahead at the end of his chosen path.