Indeed. After reading post #1176548 it all became much clearer.
That's the exception, a mirror world.For example, did you ever "meet yourself," REIMU?We're not talking about here, but in the future.The dominant hand of the Reimu you met was opposite to yours, correct?Victory Lines of a Same-Character MatchAlmost every day?In that case, I might have. Just the one time, during Tenshi's incident...Who are you?... is what I unintentionally asked.Hmm-hmmm... Then, I completely have no clue.But Reimu met with you.In other words, paradoxically, even when you came to the past, it's nothing special!
... The offertory goes without saying.