The acrobatic unit "Trinity," comprised of identical triplets Fumine, Shori, and Mizuki, boasts perfect synchronization, cultivated over many years of living together. Their long-awaited solo performance is fast approaching, and their excitement is at its peak. However, the eldest, Fumine, is harboring a heavy secret. She has decided to leave the unit after the performance and move to America alone. Fumine is torn between the "dreams of the three" and her own future. Meanwhile, they meet a pair of sisters in the practice studio. When the younger sister, Hitomi, innocently asks, "Who's the best dancer?", the trio is about to open the Pandora's box of "individual differences" that they have unconsciously ignored. Then, when Fumine's hidden "plans to go to America" ​​are finally revealed, a decisive crack appears in the bond between the trio.