This is the story of the people on the same ocean as Luffy. They are all flesh and blood, not a simple pile-up of several settings.
This story will be very long and will be about ideals, freedom, bonds, struggle, growth...
There is no time travel, no system, it is not a cool novel, and there is no adaptation.
This novel and its characters are purely fictitious. Any similarity is purely coincidental and should not be imitated.