I hope Miyata can come out on top. Rinrin is definitely set up to learn a lesson here. Obviously won't end with the first attack, but that should be a good wakeup call. If she takes others lightly then she'll suffer for it. At the very least she should recognize the threat of a character who wears a different swimsuit from the others
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Certainly interesting how the teacher is making the MC suffer quite a bit. But for the sake of strengthening her body to withstand that technique. It's kind of impressive how far a person will go for the sake of becoming rich. She is completely willing to risk wrecking her body for it.