His best friend’s girlfriend is a major red flag in this story — like wtf, casually mentioning a foursome? Oh hell naw….
She is... But then again she also pulls serious support moves (the acrylic incident, and basically this entire chapter). The fact that her behavior is so back and forth makes her, at least, better than the very shallow easily-disliked mess she was in the earlier chapter. She does have an odd fixation on the foursome thing, but realistically, beyond her constant VERBAL instigation, there isn't really any other evidence of her true nature. I don't think she's going to turn out to be "wholesome and pure", but conceptually it is set up for her to not be quite so crass and unhinged in her motivation. That being said, she could easily go full red flag and Towa could turn out to be exactly like his Hentai doppelganger (he's probably the biggest side character enigma at this point). I do appreciate the flexibility at this stage of the manga.
As ever, thanks to Eresh for scanlating.