Moto Heroine, Mob ni Naru

Meiko Kadomatsu, also known as Mei Nakamatsu, was once a child prodigy who took the world by storm. After retiring from the entertainment industry due to her parents' scandal, she now lives a quiet life out of the public eye. Then, a young man named Chika, who aspires to be an actor, appears before Meiko and asks to become her apprentice...!?

(Source: Our Feel, translated)