Chocotto Sister/Headscratchers

• Shouldn't Choco be going to school?
  • Why would she? She already has a book that contains all the knowledge she needs :)
• Why is nobody amazed about Choco's sudden appearance?
  • They are. Its just that nobody around knows much about Haruma, so they probably never asked if he has siblings. When one of his relatives come to visit, that was a big problem though.
• How does Haruma go about the problem that Choco has no birth certificate? Getting dental care or health insurance would be a problem, for one.
• Of course, "Santa" could have seen to it that Choco has a birth certificate, identifying her as Haruma's sister, but why is that never mentioned then?
  • Do we need to know all the details? He just got a little sister, packed with everything he needed of her. Being healthy and insured was also part of his wish.