Billion X $chool

A high school teacher on the surface, a super CEO underneath!? A new homeroom teacher arrives for Class 3-0 at private Eto Academy, a class filled with students with "zero motivation, zero talent, and zero future potential." Assigned to this ridiculously underachieving class, nicknamed "Class Zero," is a handsome but somewhat eccentric teacher named Kagami Rei. This teacher, whose wealth and drive are "extraordinary," defies all school norms. His true identity is a billionaire, the CEO of one of Japan's leading conglomerates!

(Source: Kadokawa, translated)