Kimi wa Budokan ni Tatenai

Still working as underground idol at the age of 25, Sayaka Narushima was looking for a place to live when her idol group suddenly disbanded. That same day, she is chosen as one of the prospective members of a new idol group being put together by a talented producer, who has promoted various popular groups in the past. After 7 years of hard work, Sayaka thought, "Maybe this is my big break!" She is determined to give it her best shot and make her debut on the big stage, but what she finds is something more resembling "hell"....

(Source: Coamix, translated)