After rewatching that letter scene recently, I got this idea for a new game thread! This is along the lines of the "My dear Chloe" thread, you're supposed to post something Kirika would write to Mireille in a good bye letter, starting with "Daisuki na Mireille". Here's an example:
Daisuki na Mireille, Chloe told me they would let me have a cat at the Manor.