It’s interesting that you brought this up, because I’ve actually developed a mini-theory about it!!
[All of this is making the assumption
that Germany is Holy Rome]
However, we only know that Germany
has a thing for maid dresses. Here, Prussia is reading an entry from Germany’s diary.
Germany’s embarrassed reaction when he finds out that Prussia has read this is a dead giveaway.
What I’ve seen other people validly speculate about,
and what I also believe could be true is that this might be Germany
subconsciously [indirectly] remembering Chibitalia.
This would fall consistent with how he appears to recall fuzzy memories of Chibitalia in Buon San Valentino.
Now, while the subject of a school
uniform is not quite the same as a maid’s uniform, it’s the fact that they’re similar
enough. In that case, perhaps France is inadvertently trying to jog Germany’s memory
in getting him to remember that he’s Holy Rome.
This would explain why France asks
Germany to come over “discreetly” – in a hush-hush manner. Perhaps this is
because the other nations have an unwritten but nonetheless agreed on pact to
not mention Germany’s past.
Ex: We’ve seen England grow uncomfortable
upon recalling a memory of Holy Rome, Lithuania is relieved when Germany doesn’t
remember him when they first meet, Japan notices that Prussia doesn’t tell
Germany everything about his past.
Also, notice how Germany is wearing a cloak…. another tribute to Holy Rome?
Ellawritesficssometimes 