The protagonist is a mid-level manager. During a business trip, a female employee (Kanna Misaki) unexpectedly tags along without permission. She confesses, "I prefer older men," and acts toward him in an affectionate, couple-like manner. In scenes set in the bathroom and upon waking up, their bodies press close together, creating moments that draw the man in. However, in the end, she leaves behind a note saying, "I'll head back by train first," and departs. A deeply captivating love story unfolding through this bittersweet turn of events.