Maybe it's from her mum or something, or Gaki
I think Ai-chan has the most potential to make it in America. (Not that I'd wanna share her with the ppl at my school, etc.) Her English is probably the best in MM, maybe even H!P. In that old Haromoni episode where they were learning English.............DAMN! You could tell she was trying her best and read the sign instead of just repeating, like everyone else! Go Ai-chan! Ganbare! Just another reason to love her!