Kaho, who has earned the trust of those around her and has successfully completed numerous jobs, has been assigned as the mentor for Ema, a new graduate who joined the company this spring. However, while Ema is capable at work, her arrogant and independent nature has been causing Kaho headaches as a mentor. One day, Ema, who usually gets her work done efficiently, surprisingly stayed late. As a mentor, Kaho reluctantly decided to stay with her. When the last train left, Kaho ended up staying in a hotel room with Ema until morning, as per Ema's suggestion...