Wakaba isn't really that dense or in denial, she pretty openly cares about Komaki, she's just frustrated to do so because it sucks being in love with a bitch who hates you. I can barely comprehend why Komaki thinks Wakaba hates her and her consent is impossible to get
Wakaba is more consistent, and convinced herself that she hates Komaki. Yeah her love is obvious from an external point of view (both are), but that doesn't mean Komaki is going to feel confident in confessing. In fact, I seriously doubt Wakaba would even take such a confession seriously - she's convinced herself that Komaki is this heartless, distant person she has to bring back to heart, and doesn't seen that Komaki is already down to heart and right next to her. Well, at least if we were playing blame game, it would be pretty easy to say that Wakaba refusing to recognize that Komaki is in love with her despite her constantly making up "games" to be closer to her, both simply to spend time with Wakaba and to get intimate.
IMO it's pretty obvious both are in denial and refuse to admit how much the other loves them, and twist their own minds to justify not recognizing and confessing their own feelings. It was actually the point were the manga picked up for me, realizing Wakaba's mind is also quite twisted and distorts things, much like Komaki.
Also, while the intensity is obvious excessive and beggars belief, not to mentions materializes in... not the healthiest way to put it mildly, I like that the root cause of the distance between them remains simple and likely. Komaki sees Wakaba as a pretty, popular girl she likes, but who doesn't like her back for who she is, and wants to stay close to her but believes it pointless to confess. Wakaba sees Komaki as a rival, someone she loves being with but who doesn't want to say nice things about her, doesn't want to admit to herself how close they are.