High school students Miho and Shouta are preparing for college entrance examinations. Miho comes from an island without even one cram school, while Shouta lives in Tokyo and works a part-time job. Both are striving to pass exams so they can enter college. The pair enroll in Z-Kai's correspondence education courses, and their lives cross before they realize it.
An ex- CIA operative is brought back in on a very personal mission and finds himself pitted against his former pupil in a deadly game involving high level CIA officials and the Russian president-elect.
Based on the real life story of legendary cryptanalyst Alan Turing, the film portrays the nail-biting race against time by Turing and his brilliant team of code-breakers at Britain's top-secret Government Code and Cypher School at Bletchley Park, during the darkest days of World War II.