>>715559020
My first team was S. Asuna, Kokona, S. Kanna, S. Saki (she also has a special bonus for special students). Serina and I had to borrow a Satsuki from my club, someone had a 5 stars, level 90 Satsuki. Which was enough for extreme
My second team was Yuuka, Rumi, Akane, Shun, Karin level 80, 3/5/5/5, four stars and Nodoka Spring. Mashiro was also an option
I didn't had to use my second team. But from what I can see, for Insane you will require multiple teams.
I'm going to ran some simulations, but it seems Extreme is my limit for now.