A CIA agent who, while on assignment in Russia shortly before the fall of the Soviet Union, is captured by KGB forces and placed in a mental hospital. Eleven years later, Carville is given a chance to earn his freedom.

保科恭子（铃木梨央饰）、土井友彦（中川翼饰）和酒井美和（芮成穗饰）是就读于“阳光学苑”的同学，这所学校建造在崇山峻岭之中，与世隔绝。堀江龙子（伊藤步饰）是学校里新上任的老师，尽管一开始是被学校的教育理念所吸引才来此处工作…