This drama tells the story of the 3rd grade class 0 in the private Eido Academy, which gathers students with "zero motivation, zero talent, and zero future potential". The new class teacher is a handsome but somewhat weird teacher, Kagami Rei. The common sense of the school is no longer applicable. He has "outrageous" assets and mobility. His true identity is the CEO of the chaebol group representing Japan, and he is an unexpected "billionaire". Although the times are changing, the problems of adolescent children have not changed at all. The new hero Kagami, who breaks the common sense, faces various problems and grows up with the students here.