Rinko Omuro has spent years building her career at a confectionery company when she is assigned to mentor new hire Ryoma Shindou, whose abrasive confidence immediately irritates her. The situation becomes more frustrating when he proves just as competent as he claims. Workplace rivalry changes after the two cross a personal boundary outside the office, leaving Rinko to manage a relationship in which the junior colleague challenging her professionally is now also part of her private life.