This has a lot of potential to be a party game!
I think the combat felt a bit unreliable. Sometimes I managed to stun the other girls, but there were enough occasions where it seemed as if it didn't work. If it's tied to a stagger, I think it needs to be clear. Otherwise, maybe add the possibility of gathering strength by holding the attack button to give a blow that really hurts other players (which would feel more consistent and fit into the anime aspect of this as well).
This is a really cool entry though, well done.