I think this new girl is just blunt or sharp with words but is actually harmless.
My impression of Sei was the opposite: that she is deliberately destroying Hina's self-confidence in order to make her entirely dependent on her approval. But maybe I am being too harsh on her and she's just blunt without an ulterior motive, but even so, her interactions with Hina do visibly harm the latter's self-esteem, so I wouldn't call her "harmless" overall.
yeah she's pretty toxic. i guess the question is if she's deliberate and manipulative or if she's panicking and really bad at staying with the girl she's in love with in a healthy way
currently i'm getting more of a "lashing out" vibe but we'll see
the art style here really is so great. Mishima is so powerful