ワン、ツー、スリー!! (One, Two, Three!!)

One, Two, Three!! is a song sung by ONE Akasaka, IA Akasaka, and Flower Yamako. It is the two-hundred-and-fiftieth track, the two-hundred-and-fifty-first track, and the two-hundred-and-fifty-second track in Other Vocaloid Songs 129: Mostly ONE.