Manga: After graduated from a magic academy, 10-year-old genius boy Negi Springfield was assigned to a huge Japanese school as an English teacher for practical training. To his surprise, the 8th grade class assigned for him is all-girl. In addition to teaching (and being teased by) those 31 pretty girls while trying to keep his magic capability in secret, he's also looking for clues about his father, who was once known as "Thousands Master" but mysteriously disappeared years ago.
After graduating from Merdiana Magic School in Wales, 10-year old prodigy Negi Springfield is assigned to be an English teacher at Mahora Academy in Japan as training to become a Magister Magi. To his surprise, he is tasked with a class of 31 older girls, 2-A. The story tells his life and times as he juggles with keeping his magic a secret, trying to gain acceptance and respect from his students, helping them with their problems as their teacher, dealing with threats from inside and outside the academy, and finding his father, the legendary "Thousand Master".
Anime: 10-year old Negi Springfield is a wizard-in-training, and needs only to pass one more test in order to become a Master Wizard. Unfortunately, his final task is a bizarre one- to become a English teacher at an all-females boarding school. As soon as he arrives, he completely embarasses one of his students, Asuna Kagurazaka, and replaces the teacher she loves, which garners her hatred. To make matters worse, Asuna learns that Negi is a wizard,and promises to tell unless he helps her out. But, unfortunately, circumstances force them to work together to do many things, from fighting evil wizards to helping the class pass their final exam, with a lot of humor, magic, and romances thrown in.
(source: ANN)