This story revolves around agent Q who is world number 7 ranker known for her special shotting speciality and never failed any mission . But after an unexpected metting with the mafia leader " Erion " she failed the first time . And lost her best friend in that mission . From then on she vow to Revenge against this ruthless mafia but unfortunately her agency's CEO aka the number world one ranker told her to stop this case as from now he will lead this case . Unable to sit and watch , she took a vacation and started gathering information about that ruthless mafia. Unknowingly that the world number one ranker is obsessed with her and is on his way to get her back .