Its a musou game. If you can figure out which menu is the story, and which is the free mode stage select, your fine even in raw japanese.
The finer point of the coins upgrades might be lost, but even that is pretty self explanatory.
Yeah PW 2 was not hard to understand in Japanese, I got a Menü Translation and after 2 Hours I was in the Menü. Same with Dragon Quest Heroes at the moment, I play the Japanese Version and had the Menü Translation from Shonegamez. Thats very helpful and I no know all for the Menüs. I don't will be able to use Alchemy but that is ok, i can play the Game.
So will it be with Pirate Warriors 3, Shonengamez will provide a Menü Translation and so I can play the Game perfect. Its very easy today to play a Japanese Game and don't speak it, especially a Musou Game. And I have a Youtube Channel who makes Walktroughs, so when I'm stuck like one Time in PW 2, i can look it up :)
Great to See Tashigi New World Outfit.