As the onset of World War II loomed, obtaining intelligence about the social and economic status of other nations became a coveted asset. To secure such information, Japan established a fresh espionage unit called the "D Agency."
Under the leadership of Lieutenant Colonel Yuuki, a team of eight agents was deployed to embed themselves in powerful countries and closely monitor any developments related to war. These operatives were trained extensively in survival skills, language, and communication. Their most crucial asset, however, was their ability to use cunning tactics to extract crucial information from people. They were determined to gain an advantage for their country.