Premieres in Japan May 10, 2024. They also released a PV here. This is being made by Cloverworks. It adapts a novel by the same name written by Kazumi Takayama. She is a former idol, so she has firsthand experience with becoming an idol, which is the subject of the book. I can’t find a good synopsis yet, but will update here when I do.

Edit: Synopsis from ANN:

The novel depicts the 10 years of a girl who aims to be an idol. Yū Higashi, a high school girl, aims to be an idol. To achieve her dream, she sets four rules for herself: she will not be active on social media, she will not have a boyfriend, she will not stand out in school, and she will make friends with beautiful girls from the north, south, east, and west.