Yuri Maroev is a secret agent and assassin for the Ural Republic sent along with his brother on a mission to Japan. Once in Japan, he meets systems analyst Mashiro Rieru and uses his high-level security access to obtain top-secret information from the Ministry of Foreign Affairs. His pretense of romance turns into genuine feelings of love, as Rieru becomes more immersed in the intricacies of Yuri's fateful cover-ups.