If you're looking for manga similar to IDOLiSH7, you might like these titles.
The "idol-training produce game" takes place at a private boys' idol-training school with a history of turning out many great talents in show business. The protagonist is the school's lone female student who transfers to the school because of a special situation, and enters the school's producer department.
Hana Shiraboshi might seem like a typical high school girl, but she carries a secret: her mother is the president of the talent agency White Star, and Hana happens to get a nosebleed any time she’s around a potential idol-to-be! One day, Hana is 'scouting' in Central Park when she sees a group of five boys arguing, as a major nosebleed ensues and causes her to faint. To fulfill her dream of becoming a manager, Hana must now find the five boys once more within one month and convince them to become idols... but will she be able to do it?
Hina loves the leader of the group, Chiaki. After their representation, she was so excited that she came to see Chiaki. And they kissed!! Then, they started going out together.