Komomo Rita: Mochikomi ni Kita no wa Gokudou Musume

Morita Shinichi is a charismatic editor who has driven the manga industry, with over 50 million copies of his work in print. He oversees well over 100 authors, and if he works on them, they're sure to sell... But then, the "most dangerous" new author, Komomo, comes to him with a proposal! This is a manga artist and editor's work story that exposes the methods of manga editors that you don't want to be known about!

(Source: Kodansha, translated)