Koyori has always liked Norihito, but she never had the courage to confess those feelings. As graduation draws near, she starts questioning whether she should really let things end this way. She joins a graduation trip with a few classmates— Norihito included—hoping to make some final memories. But an unexpected incident leaves the two of them stranded together, just the two of them… Their first shared warmth, their first time, their first climax… Morning arrives for the two of them— But what awaits them after that?