I can't believe I can't beat this despite all my new students. I just can't deal with yellow damage no matter what combination I've used. Tried all permutations of Tsubaki, Rio, Kisaki, Ako, Maki, Marina, Cherino, Moe, Saki, Momoi, Midori, both Neru, Hoshino, Midori, Yoshimi and the boss is still at 30+ bars every time.