If you're looking for manga similar to Pink Rush, you might like these titles.
Yozora starts her high school days at the Moonlight Academy, a school that specializes in music. She is chasing after Umiyuri-sama, a girl with a heavenly talent for singing.
Sakura Oto, an unpopular member of an idol group, finds herself in between two idols from the same group who have... interesting personalities. Beginning with Rin-chan, the newest and most popular addition to the group. While she is the most popular girl in the group, she is also Sakura's number one fan. Next is Ritsuko-san, a free-spirit and complete flirt who is just as popular as Rin-chan. With all of them living together, Sakura will have to deal with cohabitating with a superfan and womanizer, all while trying to figure out her own insecurities as an idol.
Julia Tachibana, an experienced idol, is infuriated when her boss saddles her with playing 'senpai' to 15-year-old new recruit Ran Asakawa. But the moment she first lays eyes on the tall, cute blonde who is to be her kouhai, all of that changes...
The meeting between two cold beauties, the ambitious Ai and the impulsive Tomo, and the complicated relationship that blossoms between them.
When it comes to idol group ChamJam, Eripiyo is the oldest — and perhaps only — fan of Maina Ichii. Despite Eripiyo's enthusiastic support, Maina is the least popular member of the group, but that doesn't deter Eripiyo, even though she spends so much of her money that she only has a single outfit of her own. But her love for Maina doesn't waver, even though she knows she might never be noticed for it!