Arrival of the Rookie Teacher With a Secret!!

Arrival of the Rookie Teacher With a Secret!! is the first episode of the Gokusen anime.

Synopsis
Yamaguchi Kumiko arrives at Shirokin Gakuen wear she begins her career and dream as a mathematics teacher. Upon arrival at the school, she and her fellow new teacher, Fujiyama Shizuka, are escorted to the principal's office where they are given immediate instructions to change into training gear as well as being warned about the students by the vice principal.