This drama tells the story of the 3rd grade 0 class of students who gather "zero motivation, zero talent, and zero future" in the private Eto Academy, and ushered in a new class teacher, who is a good-looking, but somewhat weird teacher Kagami Zero. The common sense of the school is no longer applicable, and his assets and actions are "outrageous", and his real identity is the CEO of a chaebol group representing Japan, and he is an unexpected "billionaire". Although times are changing, the problems of adolescent children have not changed at all. Kagami, a new hero who breaks common sense, faces various problems and grows together with the students.