If you're looking for manga similar to The iDOLM@STER Dearly Stars: Splash Red, you might like these titles.
Takumi Mukai, a tough girl who leads a motorcycle gang. When she meets a certain person, her destiny begins to change, and she decides to become an idol.
2038, Tokyo. Artificially intelligent androids have started production. Even smarter and more beautiful than regular people, they steadily replace humans in various roles. However, unlike in anti-android America, in Japan, the android idol Reina's wild popularity seems to herald a bright future for her kind. Though, amid this, android “deviants” begin to appear, rejecting their duty for free will and real emotions. With a human girl as a thread, these deviants begin to spin a revolution in Japan.
There are many idols with long-established talent agency 346 Production. And now the company is starting a new program, the Cinderella Project!i Girls leading normal lives... They are chosen to be aspiring idols and see another world for the first time in this Cinderella story. Can they all climb the stairs that lead to the palace? The magic begins now...