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zetsubouzanto : No, just like the main pair they're not officially going out, just act a lot like they do.
They've gone on 'date' and other things, but one or both of the parties didn't treat it as such.
Although the two are aware of the other's feelings.
Just that the guy was a pessimist who wasn't sure why this popular girl would like him, while the girl herself also didn't want to push it too much until he's willing.
They're slowly getting closer though, unlike the main pair that's practically married already just that one side is too dense and the other a tsundere.