ファンレターでしょう
fanretādeshō
1. Probably a fan letter.
Noun
#44170
1. Probably a fan letter.
1. fan; enthusiast
2. (electric) fan
1. love letter
1. fan club
1. letter
1. fan site (website run by fans of a celebrity, TV show, etc.); fansite
1. funky
1. newsletter
1. it seems; I think
2. right?; don't you agree?
1. If a fan; For a fan