On the night of the fireworks festival, a sudden, violent downpour caused her and her childhood friend to rush into a motel to seek shelter from the rain. (The rest of the text appears to be unrelated and refers to a separate incident: "HMN-883" and "Ring House Ringing".)

The three of us went to a fireworks festival together. On the way back, it suddenly started raining heavily, and I got separated from one of them, leaving only Natsu and me alone. Rin used to be a bit childish, a close childhood friend like a younger sister, but recently she's suddenly become very womanly, making me start to have strange feelings for her. Underneath her rain-soaked yukata, the outline of her underwear was faintly visible. She suddenly looked so sexy, and her expression, so different from usual, made my heart race. The rain intensified, and the two of us rushed into a motel. We, who would never normally cross that line, were thrown into disarray by the heavy rain, and that's how this night happened—.