She hasn't shown up again so far. The only mention has been from Kuro and Tetsuhiko talking about her motives for showing back up again. The volume has pretty much been dedicated to all of the fallout from the end of volume 1: A new girl got introduced as an acquaintance of his best friend(I think she's a first-year), Haru apparently turns into a scared feral animal whenever Kuro approaches and tries to touch him(he darts behind Kachi, who gloats so hard over it, lol), Kachi has started using Kuro's rejection against her and starts talking with Haru more openly, and Kuro formed an uneasy alliance with Tetsuhiko with the goal of winning Haru's affection again.
Same here, lol. I'm curious as to how Haru's gonna react to finding out that Kuro is scheming even harder and enlisted his best friend to help, especially since he's already noted to himself that he needs to draw a line with Kuro after what happened.
The other girl needed to be fleshed out before this. It’s coming off super creepy without her side (presumably she actually does like him based on the title).