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Okay so the new guy doesn't actually seem to be all that bad (thought he was just going to be some random character that liked/hated Sakura then drop out of the picture). I wonder if he is going to be the type that sees Miyazawa as "evil" for changing Arima and then try and separate them but in the process realize the good qualities and fall for Miyazawa. I don't think so because of the fact he has that whole past with Sakura however that plot above is so common I could totally see it happening too.
Anyways, Sakura was pretty mean to him in the past, wouldn't blame him if he actually does something really mean to her. Although given his personality, he actually seems like he won't really do anything (he seems like the clumsy type).