If you're looking for manga similar to The iDOLM@STER 2: Nemurihime, 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.
To-Y (Fujii To-ii) is a member of the punk rock band GASP. Along with other punk bands, which usually just hanged out doing small gigs, they have this enormous hatred and aversion to the main Japanese music industry, which is dominated by pop music and untalented Idol singers. However, To-Y was tempted by Kado (the Nagel ripoff) of Kama Production, a strong will promoter, to expand out beyond GASP since he has the talent, except she also expect to promote him as an Idol singer, which revolts To-Y.
Green Leaves Entertainment is a tiny production company on the verge of going out of business in Sendai, the biggest city in Japan's northeastern Tohoku region. The agency once managed the careers of magicians, photo idols, fortune-tellers, and other entertainers, but its last remaining client finally quit. In danger of having zero talent (literally), the president Tange hatches an idea of producing an idol group. On the brash president's orders, the dissatisfied manager Matsuda heads out to scout raw talent. Matsuda makes a fateful encounter with a certain girl...
In the year 2032, the legendary idol unit "7th Sisters" suddenly retired from the industry and disappeared. That was the end of the idol industry... until two years later, when a young glory-seeking employee is appointed to be the leader of Tokyo's next generation idol studio, "777 (Three Seven)," commonly referred to as Nanastar. However, the city continues to believe that idols are a thing of the past, and Nanastar is no exception. Their slump continues, but one day a mysterious and beautiful female manager approaches you and says, "If the idols of the past are gone, we'll just have to make new idols! True "sisters" linked by powerful bonds!" The story of the idols of the future, the Nanastar Sisters, will now unfold.