Shioriho, who has been trusted by those around her and has completed many jobs, has been put in charge of training Ema, who joined the company as a new graduate this spring. However, Ema is good at her job, but she is cheeky and does things at her own pace, which gives Shioriho a headache as her trainer. At that time, Ema, who is usually good at her job, was working overtime, which was unusual for her, so Shioriho reluctantly stayed behind with her as her trainer. Then, Shioriho missed the last train, and at Ema's suggestion, they stayed in the same hotel room until morning...