Alyosha Stalina, a foreign exchange student, has been attending a Japanese high school for 3 months. She hails from the nation of Solessia but has yet to fit in with the other students due to her unfriendly demeanor and cold personality. This is understandable, as Alyosha is a trained assassin who has been murdering people since she was 5 years old. Officials in Estolakia, a country devastated by attacks from Solessia, found the orphaned Alyosha and trained her as a top-notch assassin to work against Solessia. Her most recent, and soon-to-be last, mission is to murder the president of Solessia, who is scheduled to attend the high school she has infiltrated for 3 months. However, the mission is aborted, and she is ordered to remain a student. The only thing Alyosha knows how to do is be an assassin; she has never learned how to be a normal teenage girl. Will Alyosha be able to complete her most difficult mission yet?