Chiaski never stood a chance, even if Moka had broken up with Ueno here, there's no chance Chisaki can have a relationship with Ueno beyond bullying him, there's too much bad blood on both sides for a romantic relationship to work, at best they can become real friends, at worst they might end just parting ways for good after this, same goes for Kanako, she only wants to torment Ueno because of the fact she can't be with Chisaki.
The only girl out of the bully girls who has any chance of actually dating him is Tsubomi but in all honestly I think the rest of the series is going to play out straight, this chapter could easily just been Moka running away, more drama, misunderstandings and continue Ueno keeping the truth from her but Ueno was honest and they both communiucated.
I think all that's really left is for Ueno and Chisaki to have one last conversation where Chisaki is honest about how she feels.