If you're looking for manga similar to Marginal#4: Kiss kara Tsukuru Big Bang, you might like these titles.
The protagonist Fujisaki Futaba is a university student who had no interest whatsoever in idols… until she got a job at James Entertainment and is assigned to manage the popular idol group, “forttê”.
Comic anthology featuring the characters from the otome game Starry Sky: In Summer.
Collection of shorts stories featuring characters from the otome game Starry☆Sky: In Winter.
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.
Tokyo Yamanote Boys is a confession tournament held in Tokyo. This year Chihiro is chosen to be the princess, which means that she gets to spend a fateful dreamlike week with the boys.
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.