katakana.js
Copy and paste this into your JavaScript console:
([,ăŚ,,,,ă˘]=[]+{},[ă,ă,ă,ăť,,ă,ă,ă,,,
ă]=[!!ăŚ]+!ăŚ+ăŚ.ăŚ)[ă˘+=ăŚ+ă+ă+ă+ă+ă+
ă˘+ă+ăŚ+ă][ă˘](ă+ă+ăť+ă+ă+'(-~ăŚ)')()
The minified source is exactly 99 chars.
Many thanks to @centime, @subzey, @xem, @nitram509 and @drzhbe for their great help!
Check out the annotated.js to see whats going on.