Ever since Yumi (Yumi Kazama) met her ex-boyfriend at a class reunion, she couldn't do anything but be distracted. Since then, she hasn't been able to get his face out of her head. And memories of those days come back to her. They were both young and lacked courage. How much she regretted that their pure relationship ended afterwards. How would it feel to be held by him? The feelings that hadn't disappeared for 20 years swelled up to a point where they could no longer be contained when they met again. At that time, Yumi's husband was going on a business trip and would be away from home for three days...