Anna Tsuchiya (土屋 アンナ, Tsuchiya Anna, born March 11, 1984) is a Japanese singer, actress and semi-retired model of Irish and Polish descent. Since 2005, she is primarily known as a singer.
Spin Aqua were a short-lived musical project between the model Anna Tsuchiya and the former Oblivion Dust guitarist K.A.Z. The duo performed music together for a year and seven months; releasing music for less than a year under the on the popular label Ki/oon Records.