Girls & Panzer, Wake Up, Girls! Recommendations
Both of these shows have a similar setup for the lead female where she leaves a prestigious group because of their group's ruthless ways and is determined to never participate in the activity again. But she end up returning to the activity with a startup team that's more about friendship than results. Of course, the major difference is that WUG is all about singing and being an idol, while GUP is all about action with girls battling with tanks.