ah yes, a Just Friends ending. I guess you can kinda tell from pretty early on that this isn't the kind of series that's going to make any actual real changes or developments between their characters.
I'd say it's fair to call the main "relationship" yuri-bait.
kissing alone doesn't imply a yuri-type relationship, as even straight women can be okay with kissing other girls (especially in the younger experimental periods). at the very least though, some of those side-characters do seem to have some gay stuff going on, but, like...