@Teddy I think that's a copypasta. At least, I saw 4chan screencaps about Megumin that looked the same. On the other hand, I don't remember them being that long.
Iron Blood destroyers that aren't Z23? The Königsberg sisters? Deutschland? A bit of Spee, Gneisenau and Scharnhorst? Swimsuits?
This might just be one of the best chapters of the whole anthology.
I'd wonder if making a Nazi warship call someone "Genossin" ("Genosse", like the English "comrade" is typically used by Communists) is intentional irony, but the wrong grammar already shows that the author had no what he was actually doing.
Reminds me of the other bonus chapters with Sirius and Spee. At least, it has the same pattern in that one chapter is very fanservicey, while the other is very cute.