Sakura Santa/Headscratchers

Itsumi Route
""My entire life up until that point had been spent with [Itsumi]. It's a surreal thought when you think about it. Bonds just don't fade. You might forget about someone, or not quite remember their face... But when you meet them again, it all comes back to you.""
 * If Itsumi means so much as a childhood friend to Koji, then why didn't he remember her when he was with the other girls (in separate continuities)?
 * Koji's thoughts indirectly provides an explanation in her route:


 * During their first date, Itsumi wonders if Santa (she's thinking of the typical character) knew what she wished for this year. Koji acknowledges her, by referring to Santa as a "he"... Except he knew Santa was a "she"! He met her in person!
 * And no, Koji wasn't hiding his meeting with the mythical figure to Itsumi, because he doesn't say or think anything about the matter.
 * To answer the question, Santa couldn't have known what Itsumi wished for, since Itsumi is an adult. Santa, as witnessed by Koji, can read children's hearts, but only children's, as she had to ask Koji for his wish.