It's a new era, Reiwa. A high school located in Kabukicho in the Shinjuku district of Tokyo. Known as Toritsu Mizusho, it is a metropolitan school that provides education related to the night entertainment business. Ishiwata Naoki, 23, who has been looking for work, finds employment in the night business for the title of "teacher" because of his girlfriend Haruka. After getting a job, he learns for the first time that this school specializes in such a business. She runs four courses: cabaret, host, manager, and soapgirl. Naoki is uncomfortable after he learns the truth about the school, such as the "champagne calls" at the morning assembly and the fierce competition at the cabaret practice. He ends up being put in charge of Class 3C, but quickly gets into endless and unexpected trouble caused by his students.