Sensei, Machigattemasu.

A young man begins working as an English teacher at an all-girls middle and high school, despite being only 16 years old. He had failed his high school entrance exams and is using this job as a way to avoid repeating his studies. To maintain his position, he pretends to be in his twenties and qualified for the role. While he enjoys the attention from students who regard him as an authority figure, he faces the risk of being discovered if the truth about his age and inexperience comes to light.