You can see an announcement video that was released here. Synopsis of the first season from AniList:

Tokyo’s brand-new Yuigaoka Girls’ High School has no history, no upperclassmen, and no reputation—its first students are starting from scratch! A team of five girls led by Kanon Shibuya discover school idols, and their hopes to do something with singing begin to grow. They begin the “School Idol Project” with a blank slate and infinite potential. It’s time for their Love Live to take flight!

disclaimer: I am not really familiar with the series and there are tons of Love Live series, so I hope I pulled a synopsis from the correct one.