DID YOU KNOW?
The inside covers of the Japanese graphic novels have text on them. It’s basically the same image for all of the novels, so this isn’t actually a spoiler.
The text turns out to be upside-down nigh-illegible katakana, but the Japanese side of the SnK fanbase has managed to render it into something more readable.
It seems to concern the history of humanity before the walls.
I’m not great at Japanese, but I tried my hand at translation.