If you're looking for manga similar to Top News King, you might like these titles.
It was a time when idols brought hope to people. Their radiance reaches even the youngest of boys. A traumatized boy, Setsuna Sakura, happened to see an idol's live performance and was touched by the brilliance. Longing to be an idol who is adored by others, Setsuna decided to audition for an idol agency to make his dream come true.
College student Chitose Karasuma is determined not to do boring things as she enters the adult world. To this end, this bad-mannered beauty barges into a facility that trains would-be voice actors and actresses, somehow landing a job at "Number One Produce," a seiyuu agency managed by her older brother, Gojou. In Chitose's mind, she's poised for greatness, but finds herself at a loss when she continues to only get minor roles. As she clashes with other girls in the agency, including a cunning airhead and a girl with a Kansai accent, Chitose is about to learn that there's more to succeeding in this competitive industry than she imagined.
Chitose is a rookie seiyuu who's cute on the outside but cynical on the inside. The harsh reality and sheer weirdness of the voice acting industry is causing Chitose to lose her motivation to work. It's so bad that it's worrying her manager (who's also her big brother). Can Chitose stay on track to become a top seiyuu?
Miroku Osaki is 36 years old, unemployed, and unhappy. Having been bullied in his childhood and even into his adult life, he became a shut-in after being unfairly laid off. For a long time, the only thing that brought him joy was online gaming. Then, he tried the popular idol game called "Let's Try Dancing!" It was addicting... and transformative! Inspired by the game, Miroku decides to turn his life around. He begins singing karaoke and going to the gym, where he meets Yoichi, the director of an entertainment company who encourages Miroku to pursue his dreams.
The manga centers on Hira, a lazy manager who is ordered by his company to be the producer for COPPE, the company's rookie idol group full of trouble-making girls. While all the girls make his life harder, he spots a girl one night and scouts her for COPPE in the hopes of getting her into the group, but fails. The next morning, the girl, named Kurenai Rin, shows up for lessons. Hira declares that the group should aim for Budokan. While the girls laugh, Rin smiles and declares that she'll join COPPE.