In a secret organization, the de facto leader Oniyama is known for his extreme caution. He keeps no records of the organization's structure or business dealings—everything is stored solely in his mind. To obtain information, one must question him directly. Recently, Oniyama began hiring a secretary at his public-facing company. Haruka applied and was hired as his secretary, gradually infiltrating the organization's inner workings, becoming Oniyama's direct subordinate, and extracting crucial intelligence. Three months into her mission, she finally has a chance to acquire decisive evidence. However, that night, an unexpected event occurs—.