Our story starts shortly after Marineford, following Aslan getting forcefully isekaied. There, he becomes a Champion to bring balance back to the seas. The first book is set during the Timeskip. Many characters are different from their original portrayal due to meeting other Champions, so don’t expect Shirahoshi to be the pure foolish maiden from the manga. Fishman island arc won’t happen here due to in-story events. The second book will be a jumpstart to Punk Hazard. No, Aslan won’t join the Strawhats at any point in the story. Still he plays a considerable role in their New World’s adventures! The third book will cover Dressrosa and Whole Cake Island. The fourth, being the last, is set in Wano and Mary Geoise. Expect commander level bosses like the Kaido's All stars to have much more freedom of movement. Basically they can pop out almost at any point, always thanks to in-story events. Who finds the One Piece? That’s something we shall find out together!