This is kinda unrelated to the chapter itself and probably goes without saying considering how they're introduced in chapter 0, but the four girls all seem to correspond to different aspects of romantic love!
Koharu is obviously a timid and sweet first love, Chiyo is straight up devil may care passion and Ena seems analytical and contemplative, the kind of romance you'd have while planning for the future.
Kanna is harder to get a read on for me, since going off of chapter 0, she's stated to often pair people based on looks and would therefore be physical attraction or something, but her demeanor and the way she treats Koharu makes her seem more like unconditional love to me, or maybe even obsession depending on where this story goes.
But yeah, I just thought that was interesting so I figured it was worth mentioning, since I don't think it's been said yet (at least here, I don't follow the twitter discussions)