My thoughts:
I can't tell what I found amusing:
1. Sana and Asami, which is practically impossible now
2. Nanaka doesn't go to the Home...
Somewhat wild, but makes sense, speculations:
1. Asami sent the letters because she likes Shuusuke and dislikes Shuri. <-- Probably not true because the rumors would hurt Shuusuke too
2. Asami sent the letters for some other reason <-- I'd like to know whether Shuri and Shuusuke are considered the "excelling students" or "students that fall behind" or "normal"
3. Some other person, which would be pretty boring...