So what if Japan was the only one who knew about the fourth wall, but never bothered mentioning it, since he figured that everyone else knew about it. For some odd reason, he had little plushies of everyone because why not. One day Prussia came by with the rest of the Axis, and decided to snoop around out of boredom and found these plushies. Some of them, he could recognize, others were complete strangers, one of them, he thought, was fucking awesome... make that two actually.

Out of curiosity and wondering what the fuck these were even made for, he went to ask Japan why he had these doll things of people he knew and got a rather abnormal response: "You know, we're all in that anime about history, stereotypes, and yaoi. Remember?" Of course Prussia questioned this man's sanity and said

"Are you okay bro, I don't know what drugs you're on at the moment but this isn't fucking normal. As cool as it would be to be an anime character, we aren't them. And I here I was thinking that weeaboos couldn't be Japanese. And I'm just not even going to ask what that last thing was. But dude, what the fuck?"

He didn't know exactly where that mini explosion came from but he knows that he doesn't need a war ally who's on major drugs. Japan however, was both confused by Prussia's obliviousness to the situation, and offended by this accusation although he can't exactly blame anybody. He probably wouldn't have reacted too differently if he weren't so polite on the outside.

"You didn't know this??? Well, I get why you're all freaked out right now. But don't you ever sense some odd presence every once in a while? Well, I guess not, you haven't really made an appearance on air yet but like.... like that over there. If you look hard enough in that plant you'll see a camera. See?"

Prussia looked in the direction of the plant and sure enough, there was a camera. He thought on this for a moment. After a few seconds, he was offended because he hasn't been aired yet but decided that they didn't want the anime fans to be too distracted by his awesomeness to notice anyone else. Made sense.

"But still, you can't tell anyone else about this. It'd just be too chaotic given that everyone else turns into attention hogs when there are non-countries around. But I'm just an attention hog, regardless. Wait, but wouldn't they know that we exist?"

"According to them, we are just works of fiction."

"Yeah, but we visit our countries all the time and interact with people. Wouldn't we get recognized or something?"

"The people who watch us actually have really weird and different anatomy stuff, and they see us as one of them in real life but we just look like anime characters otherwise. Although I have gotten looked at suspiciously by several preteen girls with the look of a fujoshi."

"A what?"

"Nothing important."

"Okay... so is it safe to assume that you don't have some insane crush on most of your acquaintances and cuddle our plushies too sleep while you cry about how you don't have a chance?"

"For the most part, yes."

"And we never speak of this moment again."

"Good."

And from that day on, knowing this information, the fourth wall had to break a few times although if Japan hears him, he gets stared at in a slightly disapproving manner.

~~~~~~~~~~
What do we have here? I'm actually posting a chapter after procrastinating for several months. How odd of me ...even though it's like 6am and I'm pulling an all nighter, so that makes it less weird.