One day after school, the rain patters against the window. You, who live in the neighborhood, and Rin, a 6th grader. The two of you dashed into his house to take shelter from the rain. Seeing Rin dripping with raindrops at the entrance, you can't bear to leave her like that, so you hand her a towel and urge her towards the bathroom. Your relationship is good, and it's not unusual for you to visit each other's homes.

Eventually, the sound of the shower stops, and a few minutes later, Rin appears in the living room, dressed in a spare T-shirt and sweats. While drying her still slightly damp hair with a towel, she looked around the room with curiosity.