Tldr Girlfriend sleeps with producer to help boyfriend become idol. When he starts getting fame Producer makes break up with boyfriend because Idols can't have relationships, he protests but she ends the call. Epilogue shows boyfriend got into a scandal for going out with a girl(heroine) and apparently he retires. We then see Producer wondering if the child of the heroine was his.
Unlike most of the other men you see in hentai works, the producer keeps promise, have stand of his own profession, no blackmails, and only forced the break up on behave of the company panel's decision, um, in a hentai work.