NiziU is a Japanese girl group formed through the reality show Nizi Project, which was produced by JYP Entertainment and Sony Music Japan. The group debuted in December 2020 and consists of nine members, each selected for their unique talents in singing, dancing, and performance. The name "NiziU" combines "Nizi," meaning "rainbow" in Japanese, and "U," representing the fans. The group quickly gained popularity for their catchy songs and vibrant performances, contributing to the growing trend of J-pop and K-pop collaborations in the music industry.