Talk:Izuna Hatsuse/@comment-173.89.175.198-20140809015647/@comment-166.137.246.66-20150328015047

It's not that she has trouble remembering it, it's actually that she thinks that it means it's polite. It's noted in one of the episodes when they first met her that sora tells her that adding desu to a sentence is not meaning it will be polite. She is surprised by learning that, therefore she meant to use it in that way and still is.