Takeshi Saitou works as a recently hired security guard at Fantasien, a high-tech amusement park. During his duties, he accidentally damages a guidance display. This incident results in Takeshi and his colleague Tamami being called into their supervisor Ms. Amano's office. Concurrently, park employee Makoto Kashiwara is assigned to repair the display. Kashiwara's discovery of a hidden secret within the park ignites a chain of events involving murder and mystery.