wakes up on a tiny island island with no memory and one guy
uses a rowboat to reach a struggling civilization with a surprisingly dense culture
Make a name for yourself by saving another town from a magic user, who is disguising their attack as a natural disaster
Go up to some islands in the sky, acquaint yourself with the flight technology, investigate a bit, and defeat a source of some problems up there

Head to a hangout for boat people with your friend from the first part, and figure out what to do next.
Get a bunch of heavy tasks done in a row, and unlock a super cool new power of your choice
And thus concludes the Bronze Sea, as well as the Second Sea.
Now, the rest of the parallels aren’t in order, but still worth mentioning.
Kingdom island with corrupt leadership, a tragic history, a castle in the center, and a very blatantly class-based society
Friendly pirate with black hair wearing red who’s going on a journey of his own, and becomes a Legendary Ship boss
Central government which can be joined by players, arrests bounty players, and limits themselves to one base per sea
Do I have to say it?