I still can figure Hikaru out.
It felt like she might had just been entranced by the memories of Hana from her past, but at the same time it also feels like just the anxiety and fear of not being liked the same by Hana pushes Hikaru to find comfort in Harukata even more now.
I came for the gl so im not about to cheer for the guy, but with how heavy Hikaru love/obsession for Hana is and how Hana doesnt seen right in the head makes it hard to cheer for them either.
The fact Hana cant see Hikaru as the lil puppy she owned anymore after the slap could be good start, but it definitely doesnt make for any logical development since its a fact Hana never saw Hikaru in a romantic light before.
Considering theres only 3 chapters left for too much missing progress, i guess it aint a happy gl ending this time.