Rei Kagami (Ryosuke Yamada) is the CEO of Japan's largest chaebol group, Kagami Group, and a billionaire.He has a genius mind and is an inventor engaged in revolutionary development. He is currently conducting research on high-precision artificial intelligence, but his true identity has not been made public.As a child, he was a curious and gentle child, but as he grew up, his self-centered personality became more obvious.Such Kagami, together with her outstanding secretary and bodyguard Ichika Serizawa (Haruka Kinami), concealed her identity and worked as a teacher at the private Eto Academy.The purpose is to develop ultra-high-precision artificial intelligence AI for education.

In Eto Academy, there is a class called Class 3, Class 0, which contains students with zero motivation, zero ability, and zero future.Sho Nishitani (Rintaro Mizusawa) abandoned his studies for some reason and was reduced to Class 0.In this Class 0, there are Konno Naoto (Matsuda Genta) with the lowest deviation value, Todo Yukimi (Ohara Azusa), the daughter of Eto Academy principal Makiko Todo (Miki Mizuno),Takenaka Tenju (Yukiki Yamashita), who was originally a special admissions student but refused to go to school, Yurijojima Yu (Okuno Sou), who once caused violent incidents, and others.Konno said to Nishitani:“Do you dare to bet with me?The new head teacher will resign within a month.”

At this time, Class 0’s new homeroom teacher Kagami and deputy homeroom teacher Serizawa arrived.Kagami said to the students: From now on, you must fully experience the joy of becoming my subordinate and work hard to repay my expectations.