The film is adapted from the comic work by Arata Sawada and Renji Asai. Kanna Hashimoto plays the weak and cute pink-haired protagonist Kikuno Kei, who is working hard while attending a technical college to obtain the second-level Japanese business bookkeeping certificate. However, the part-time job is a professional killer. Kei is a super powerful killer with the highest naming rate. No matter what means or how cruel the opponent is, he will accomplish his mission. After achieving his goal, Kei left the scene and received the worst commission in history...