She is a character from a Japanese English textbook NEW HORIZON (Tokyo Shoseki).
She is described in the textbook as 「緑中学校のALT (Assistant Language Teacher)。アメリカのボストン出身。」　(An ALT (Assistant Language Teacher) at Midori Junior High School. She is from Boston, America.)
The textbook became a Twitter meme since this tweet.
https://twitter.com/haiyore_audio/status/717306000307453952

Not only that - classes haven't actually started yet...

poppoko said:

She is a character from a Japanese English textbook NEW HORIZON (Tokyo Shoseki).
She is described in the textbook as 「緑中学校のALT (Assistant Language Teacher)。アメリカのボストン出身。」　(An ALT (Assistant Language Teacher) at Midori Junior High School. She is from Boston, America.)
The textbook became a Twitter meme since this tweet.
https://twitter.com/haiyore_audio/status/717306000307453952

So, she teaches the students how to "pahk the cahr in Hahvuhd Yahd"?

Unfortunately, the unit on Boston does not even include Harvard - it has the Museum of Fine Arts.

"Big fan of Boston Red S○X"