Some us have already made our guess and they are the same as yours, so you are a wee bit late but still we agree that Tsugumi is a possibility though not sure Kosaki is one of the possibility. She is a muted character. No emotions, mischievous, helpful at times, and beats up guys way to harshly. This new girl has a smile radiating in happiness, I don't see Kosaki having that.
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