In her youth, Uta—a former member of the Red Hair Pirates and childhood friend of Monkey D. Luffy—dreamed of bringing a new era of freedom by sharing her music and joy throughout the world. When Luffy and the Straw Hat Pirates arrive at Uta's highly anticipated live performance, they join many fans eager to witness the diva's exceptional talent. However, due to a painful incident in her past, Uta holds deep animosity towards pirates. Her reunion with Luffy becomes tense once she learns of his choice to embrace a life of piracy. Upon Luffy's refusal to give up his pirate ways, Uta uses her powers against the Straw Hats, trapping their minds in a dream realm from the concert's start, leaving their physical forms sleeping in reality. The Straw Hats now race against time to escape Uta's nightmare world before they are lost in it permanently.