They're hinting PRETTY strongly that Miyabi's the sister. I mean, if she weren't, she probably would've been confused when he told her that's the reason they couldn't be together. Also, he needs to learn to lock his door better.
Something else I find interesting, do we know for sure Mister X ACTUALLY works for the company? All we have is her word. If she WERE the sister, this would be an ingenious way of getting close
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