Kei Kikuno attends a vocational school as a student. For her part-time job, she works as a contract killer. She is excellent at her job and never gets scared by anyone. One day, she receives the most challenging request.

电影改编自泽田新与浅井莲次合作的漫画作品，由桥本环奈饰演柔弱可爱粉色短发的主角菊野溪，以取得日商簿记检定2级为目标，一边上专科学校，一边努力打工。但打工的内容是职业杀手，溪是指名率第一的超厉害的杀手，不管是什么样手段再残忍的对手都能使命必达，达成目标后离开现场的溪，收到了史上最糟糕的委托……