Ami, who has done a lot of work with a lot of trust from those around her, will be entrusted with the education of Mizuki, who joined the company as a new graduate this spring. However, although Mizuki can work, she is impertinent and has a self-paced personality, which causes Ami to worry as an educator. At that time, Mizuki, who can usually work, was unusually working overtime, so Ami was forced to stay with him as an educator. And with the last train gone, Ami decides to stay in the same hotel room until morning at Mizuki's suggestion, but...