Alumni association held after a long time. Aika was thrilled to see her ex-boyfriend, but on the other hand, she had mixed feelings. I wondered what kind of future would have been waiting for me if I hadn't parted with this person at that time. I couldn't help but compare it with my current marriage, which is hard to say happy. At that time, I couldn't be honest because of my youth. But now ... Aika unexpectedly utters with the memories and feelings of those days when she revives, "My husband is on a business trip and there is no one at home.