Nagi Yanagi is a Japanese singer, songwriter, and voice actress from Osaka Prefecture, born on May 31, 1987. She is signed to the record label NBCUniversal Entertainment Japan and is also known by her stylized artist name yanaginagi. Her career in entertainment began by uploading cover songs and original music to the video sharing website Niconico in 2006 under names such as Gazelle. She was a member of the music duo Binaria alongside singer Annabel and also formed the musical unit Inochi Kokonotsu with composer KTG. Yanagi first gained widespread recognition as the guest vocalist for the popular music group Supercell from 2009 to 2011, providing vocals for songs like Kimi no Shiranai Monogatari.

While Yanagi is primarily celebrated as a singer, she has also taken on voice acting roles. She is known for providing the voice of the character Aion in the Norn9 franchise. This role appears in both the original visual novel game and its 2016 television anime adaptation, Norn9, where she also performed the opening theme song Kazakiri. Her contribution to the series extends to performing songs for the Norn9 soundtrack and its related game releases.

Recurring collaborations are a significant part of her professional career. She has worked extensively with composer Jun Maeda of Key, producing the original concept album Owari no Hoshi no Love Song. Her solo career launched in February 2012 under Geneon (now NBCUniversal Entertainment Japan) with the single Vidro Moyō, which was used as the ending theme for the anime Waiting in the Summer. Since then, she has built a prolific discography of anime theme songs for a wide range of popular series, including My Youth Romantic Comedy Is Wrong, As I Expected, Jormungand, Nagi-Asu: A Lull in the Sea, Amnesia, Black Bullet, Seraph of the End, Berserk, and Iroduku: The World in Colors. Beyond performing, she has also served as the music producer for the anime series Just Because! in 2017. Yanagi announced her marriage on her official website in August 2019.