Sandii's debut album, Sandi Ai, is a mix of Japanese originals and covers of well-known songs by John Lennon and Olivia Newton-John.
Sandii met Makoto Kubota in 1976, when he was a guest on her NHK TV show and afterward joined his band Yuyake Gakudan ("Sunset Gang") as a backup singer.
On the soundtrack of Lupin The Third Sandii performed the songs "I Miss You Babe" and "Love Squall"; the latter was a single release paired with the theme of the TV series by Yuji Ohno.
In 1978 Sandii sang the end title theme for the Japanese release of Agatha Christie's Death on the Nile, which became a top 20 hit in Japan.
With limited time and budget, the album Mystery Nile consists of disco and pop cover versions including "Dancing Queen" by ABBA.
Their live act gained many fans in the international music industry following their support slot on the final Japan world tour.
Their extensive touring and TV appearances in Australia in 1983 allowed them to achieve the #11 charting hit single "Sticky Music" (lyrics by Chris Mosdell).
Steve Cropper saw Sunsetz guitarist Keni Inoue play in his distinctive plucking style (as heard on "Open Sesame") and asked to be taught the technique.
In 1985 Sandii & The Sunsetz left Alfa Records for Toshiba-EMI, whose greater financial muscle gave the group a better budget to work with.
In late 2005 Sandii achieved the rank of Kumu Hula and celebrated with an event at a shrine in Ise, with old friend Haruomi Hosono providing the music.