This is where the letter by Miyazano Kaori is being read out. The English subtitles said,
P.S. I'm enclosing something that I've always treasured. If you don't want it, feel free to tear it up and throw it away.
I can't understand Japanese; I don't know if she was being more descriptive there. All I can see is a part of a picture of two females in skirts, and one or two little kids. One of them appears to be an adult or an older girl, and the other, a young girl. But I can't recall such a scene in the series. What exactly was she talking about, and what was the picture that was enclosed?
If the voiced description in Japanese was insufficient, does the manga shed more light on it?