The man was thinking of marrying the girlfriend he was living with. - She has a younger sister, Akari, who is younger than her and often comes to visit her house. - One day, Akari, a refugee, returns home from a sudden heavy rain and evacuates soaking wet. - However, her sister is stuck at work, leaving Akari alone with the man. - I always thought of her as a cute younger sister, but seeing her wet and transparent body, I felt like a woman, which I don't normally feel, and I lost my sense of reason and snatched my lips from her. - And they asked each other again and again until morning came.