A member of the Self-Defense Forces escapes with a microfilm containing important military secrets of Japan and the United States. In order to protect the microfilm from his pursuers, he pretends to molest a girl on a crowded train and hides it in the private parts of a high school girl. A battle for the missing microfilm unfolds among the Metropolitan Police Department, the Public Security Bureau, a delinquent high school girl, and even spies from the Eastern Bloc and the Soviet Union, but what will become of the high school girl who has become a party to the matter?