Sensei no Ojikan: Dokidoki School Hours
English name: Teacher's Time
Genres: Comedy
Type: TV, Episodes: 13
Aired: Apr 5, 2004 to Jun 28, 2004
Studio: J.C.Staff
Source: 4-koma manga
Rating: PG-13 - Teens 13 or older
Synopsis:
Meet Suzuki Mika, teacher at Okitsu High School. Mika-sensei is a good teacher, but she has a small problem... literally. Although she's 27, she is only 148 cm tall, and has the face of a child. As a result, it is often difficult for Mika-sensei to get anyone to take her seriously. 

(Source: ANN)