Onna Kyoushi Rinkan Choukyou no Ori

The main character, a normal student, has recently had some trouble attending a school that's gotten rough. It's because he became entangled with a group of hoodlums who had their eyes on her.

One day, the newly appointed English teacher Shiori Katayama arrives. With her incredible beauty immediately becoming a hot topic around the school, but as a female teacher Shiori was not a mere decoration. She declared she would revive the school traditions that had become rough, and would make it into a righteous university. It marked the inevitable confrontation with the group of hoodlums.

The battle between the beautiful teacher flowing with justice and the wicked punks is now let loose.

[From DLsite English]