Premieres in Japan May 10th. The new PV is here. Check out the ANN article for additional cast/staff information. Synopsis from AniList:

The novel trapezium depicts the 10 years of a girl who aims to be an idol. Yuu Higashi, a high school girl, aims to be an idol. To achieve her dream, she sets out 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 across the country from the north, south, east, and west.