After defeating and capturing ceassar the strawhat hat crew (plus Law and Kinemmon) are heading Dressrosa to confront the former Shichibukai, Doflamingo. According to Law's plan, they will use Ceassar as a decoy for Doflamingo. After arriving to Dressrosa, Law's team (Robin, Usopp and himself) are incharge of making the deal on Ceassar with Doflamingo, while Luffy's team (zoro, Sanji, Franky, Kinnemon and himself) will find Doflamingo's Smile factory (Smile are fake devil fruits). But unexpected things happen. Zoro's sword, Shuusui; is being steal দ্বারা an unknown thief. Sanji, which chased zoro, is getting হারিয়ে গেছে and meet a woman which (of course) he fell in প্রণয় with. Kinnemon, who also chased Zoro, is getting found দ্বারা pirates. Law's team are being found দ্বারা an orginenzatoin called CP-0. And most importantly Luffy, who found out that Doflamingo has found the Mera Mera ফলমূল (Ace's fruit) and is now setting a tournement to get, যোগদান the tournement in which he meet again none other than Bellamy.
Note: Doflamingo needs ceassar so much because he have a deal with the Yonkoh Kido. The deal is that Kido will protect Dressrosa and in exchange Doflamingo will give him Smile fruits (fake devil fruits) which Ceassar invented.