Keisuke Takahashi is a student who is known as "the genius." But the world is a big place, and the more you explore, the more you'll meet amazing people. On his first day as a 9th grader, he meets a teacher who's younger than him. Which he couldn't accept, and tries to prove that he's better than her.
The teacher is a 15-year-old woman who's named Mei Shimizu. She's one of the geniuses that's been acknowledged by the school. The young age of the teacher pisses off Keisuke Takashi. He is currently doing everything he can to reject her.
Will Mei Shimizu prove that she's worthy of being a teacher, even if she's still 15?