On a hot summer day, because my girlfriend was away on a business trip, I had to go out and buy food myself. By chance, I ran into Konomi, the childhood friend who used to live next door to me. We used to be close when we were young, but as we grew older, we drifted apart, and the last time I saw her was at a party in Tokyo about ten years ago. Konomi has grown more beautiful as she ages, and it seems she is working in this area so will be staying for a short while. Upon meeting again, I invited her to have a drink with me after work. On the way back from the bar, she wanted to stop by my house, and I kept reminding myself that Konomi was my childhood friend, so nothing would happen. But everything unfolded just as I feared. Konomi, being drunk, I couldn't let her go home alone, and my house only had one bed. Neither of us could sleep, and we talked about our childhood memories, the promises we made to get married when we grew up... Our emotions intertwined and crossed boundaries. Since that day, we lived together for three days while she was here. On the fourth day, when I woke up, Konomi was nowhere to be found, not a trace left (except her underwear), everything felt like a dream...