The fate of the nation is in the hands of those who have abandoned the law and the name. The unpredictable spy action begins! In the Special Operations Group, an elite unit of the Ground Self-Defense Force, there is a female member who is bored with her daily routine of training.

One day, at the behest of her superior, she heads to a certain garrison and is recruited by a mysterious man to join a unit called "Beppan". She was given the name "Nana". And so, she finds herself on the front lines of a national defense war filled with schemes and violence.