Veteran secretary Reiko Sawamura is set to retire in one month, and Nao Mizuki is assigned to train her replacement, new secretary Noa Kurose. One day, Kurose makes a serious mistake while arranging flowers for a client's celebration. Mizuki steps in to protect Kurose at the scene. The story portrays their growth in secretarial skills, sense of responsibility, and deepening interpersonal relationships.