Tsuyoshi works for a conglomerate company. One day, he is transferred to the Fantasien Department. The company owns a theme park called Fantasien and his job there is to work as a security guard in knight costume. Though he is confused at first, he enjoys working with pretty co-workers. But one day, one of his coworkers dies because of malfunction of the facilities and a strange message is sent to them something like a claim of responsibility. Is it Souichiro's work who created all systems of the theme park, but went missing just before it opened. A roaming white shadow. Is it a girl who committed suicide inside the theme park? Another murder case happens... All systems are controlled by someone unknown and a murderous battle now breaks out. Who? For what? Will Tsuyoshi be able to solve the mystery?