After graduation from the Tokyo University of Fine Arts and Music, Eiko Hiramatsu received her master's degree from the same university and further studied as a DAAD student at Hochschule für Musik in Munich. While attending its masterclasses, Ms. Hiramatsu made her debut singing a solo part in J.S. Bach's St. John Passion with the Bach Collegium München. Afterwards, she entered into contracts with several theaters in West Germany, and made her opera debut singing Pamina in Mozart's Die Zauberflöte. Highly valued as a soloist in the religious music of Bach, Handel, Haydn, Mozart, and Brahms, she was featured together with Hermann Prey, Peter Schreier and Edith Mathis.

Back in Japan, Eiko made her debut singing Änchen in Weber's Der Freischütz and became active thoughout the country not only in opera, but also in oratorio and lieder performances. With a wide repertoire ranging from Classical works to contemporary music, she gained praise from conductors all over the world, including the late maestro Giuseppe Sinopoli. As one of the best lyrical sopranos in Japan, she now attracts considerable attention and has recorded many CDs including 4 Madrigales Amatorios (Rodrigo), Lieder der Ophelia (R. Strauss), Creation (Haydn), and Deutsche Requiem (Brahms). A new album, The Complete Works of Mahler's Songs (with pianist Ichiro Nodaira) is to be released next year. Winner of the Giraud Opera New Face Award, she now works as Associate Professor at Ferris University, and as Lecturer at Tokyo University of Fine Arts and Music.