Kimi wa Budoukan ni Tatenai

Sayaka Narushima, who had no signs of growth in popularity as an underground idol even until the age of 25, was looking for her next place to live when the idol group she belonged to disbanded. Then one day, she is chosen to be one of the founding members of a new idol group produced by a talented producer, who has gathered popular members from various groups. After 7 years of hard work as an idol, she thought, "Maybe I can flourish here!" She gives it her best shot and makes her debut again, but what she finds there is a hellish scene...

(Source: Coamix, translated)