Unfortunately, by going exactly as far as it does, and stopping, all I get from this is, "Wow, she's a clueless asshole."
Like, I've read stuff with this sort of premise that was at least okay. This could maybe hypothetically work as a romance in a longer format if general plot arc curved towards mutual understanding. Or some such?
Or, if going for humour instead of romance: If it went further with her obliviousness and accidental-self-destruction to the point of becoming a self-aware dumpster fire, that could work. As it is these tired old tropes just feel like setting-pieces.
But anyway. I dunno, I thought the idea of these 4-page twitter mangas (when they're not a throwaway joke) was to introduce a compelling or novel premise? This doesn't seem to pass muster, alas.