A transfer student from overseas.  Her attitude and speech are that of an adult.  A member of the Track Club.    (Pani Poni, Volume 02, Chapter 20)     ~!  and he is a man  !~

The 11 year old Miyamoto Rebecca becomes the new teacher of a classroom which is full of weirdos. Despite her cute looks she's a little beast and can be pretty sarcastic and offensive. The school is not safe anymore now that she's in charge of a class and her students, Himeko, Ichijou, Rei and a white rabbit who took a liking to Rebecca help her to rough up the school and the neighbour-class with its teacher "ojii-chan".
 
(Source: Anime News Network)

Mugihito is a Japanese actor, voice actor and narrator from Musashino, Tokyo. Mugihito was formerly credited under his birth name and also Mugihito Amachi (天地麦人).

Rebecca Miyamoto is a child genius with a Ph.D. from Columbia University, and she is starting as a high school teacher. The students love to tease her from day one, and she doesn't behave much better. Now we follow this class as they strive to get better grades and cope with their new teacher. 
Chapter count includes 22 bonus chapters

Zula