After learning that Luffy planned to study Haki with the Empress on Amazon Lily, and that Zoro would be learning swordsmanship on Kuraigana Island, Chopper—whom Annie had found—still decided to stay in the bird kingdom of Torino Kingdom and continue researching the special medicinal properties of the herbs growing on the "Tree of Knowledge." He made it clear that he wouldn't be leaving with Annie anytime soon.
After that, Annie spent a week traveling aboard the Sunny before finally finding that silly Nami on the small floating island nation of Weatheria, where scientists studied the weather.
When Nami learned how Luffy and Annie had performed during the Summit War, and then heard that Luffy would study Haki, Zoro would study swordsmanship, and Chopper would research medicine to grow stronger, she soon made up her mind too. She wanted to stay in Weatheria and continue learning weather magic, and suggested Annie go find the others first.
And then...
In keeping with the saying "three strikes and you're out," Annie flew into a rage and decided she wouldn't go looking for those awful people anymore. She simply abandoned the remaining Straw Hats—Usopp, Sanji, Robin, Franky, and Brook—and ordered Duval and the others to sail to the end of the Grand Line. They would stop at Sabaody Archipelago, then dive down to Fish-Man Island, while she sailed off to roam the New World.
A week later.
Annie and the crew of her "Brat Pirates" successfully reached Sabaody Archipelago. After stocking up and visiting Aunt Shakky at the Rip-off Bar and Uncle Rayleigh, they set sail the next day, heading straight for the New World.
However...
"!!"
"Alert! Alert!"
"Boss!"
"We've spotted a huge Marine fleet ahead!"
"Their numbers..."
"At least thirty or forty large warships!!!"
At that moment, a member of the Flying