Hino and her wife are awesome
I don't think Shimamura gets excited or thrilled about anything, Adachi. So I wouldn't worry about too much if I were you.
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I like that even though she feels jealous she is intelligent enough to realize that since they are just friends, for now, she doesn't have any real reason to feel betrayed and is able to make herself feel better that way.
Yes, you are just friends now of course. But you might change that, Adachi. Don't worry too much about things and don't be too insecure. Just continue to slowly close that distance between you and you'll be fine. Adachi, fighto!!!