Shimada, an undercover ISP agent who was investigating the assassination plan on the Prime Minister of Buddhabar, was killed in Hong Kong. Kitami and John Carter, who were dispatched from the Far East Bureau headquarters, have started an investigation to protect the prime minister while visiting Japan. Then, two professional assassins, Ken Hayata and Akiko from the international assassination group Triple Z (ZZZ) who undertook the mission to kill the prime minister's aide who also came to Japan from Hong Kong and attacked the prime minister who was on a , while Kitami, John and a female called A Girl must prevented them from attempting to kill him.