Yasuyuki Okamura (岡村靖幸, Okamura Yasuyuki) (born 14 August 1965) is a singer-songwriter and music producer active in the Japanese music market. Alternate pen name Eitarō Isono (磯野栄太郎, Isono Eitarō). He started his professional career in 1985, and is known internationally for the City Hunter 2 ending theme "Super Girl", and the Space Dandy opening theme "Viva Namida".