Pre-Dreadnaught Isekai
Naval Warfare with these outdated yet extremely beautiful pre-dreadnaught battleships against monsters, inferior ships, and at times, whole naval wars. What else can a warship freak man not like? Three years before the making of the HMS Dreadnaught, four countries; Germany, France, America, and the United Kingdom were all teleported into another world with their most powerful of ships of the time. The USS Oregon (BB-3), the French Suffren, the SMS Deustchland, and the HMS King Edward VII.
All four countries equally confused and equally not understanding each other by their mix of language. But even in discourse, they had one thing in common; they had warships; and they were given a mission. It was vague, it was uncertain. But written on 'that' piece of paper were the words;
"Conquer"