Ayane, Kakari, and Mitsuki are identical triplets who perform as the acrobatic unit "Trinity." Their weapon, honed over many years of living together, is their perfect synchronization, as if they share even their breathing and heartbeats. With just 10 days until their long-awaited solo performance, their excitement is at its peak. However, behind their glorious daily lives, the leader's eldest son, Ayane, is harboring a heavy secret. He has passed the audition for the world-famous circus troupe "Cirque du L'Etoile," and after the performance, he has decided to leave the unit and travel alone to America. Ayane is torn between the "dreams of the three" and "her own future." Meanwhile, at the practice studio, they meet two sisters: Asami, the older sister who was once a dancer, and her younger sister, Hitomi, who dreams of flying too. Hitomi's innocent eyes and question, "Who's the best dancer?" are about to open Pandora's box of "individual differences" that the three have unconsciously turned a blind eye to. And when Fumino's hidden "plans to go to America" ​​are finally revealed, a decisive rift appears in the bond between the trinity.