Charlotte said she wanted to learn Japanese properly to be able to consume manga. That's certainly valid. Not everything is translated. But then she said she could never read manga with friends because they don't know Japanese. Apparently the author doesn't know there's an ocean freighter's load of manga that has been translated into English (and other languages). Yet Charlotte continues by mentioning there's globally popular manga, meaning the author does know manga is translated into other markets as well. So, which is it, huh? This inconsistency makes me think Charlotte and Emma indeed are sisters, and Charlotte as well isn't above twisting Aoyagi around her little finger a little bit.