In 1998, hiro released her first solo song, "Mitsumete Itai", as a B-side to Speed's single "All My True Love".
She made her official solo debut in 1999 with the single "As Time Goes By", which sold 800,000 copies in Japan.
A year later, she released another song, "Clover", tied to anime Black Jack, selling 20,000 copies.
Her two CDs released in 2006 sold considerably less, "Hero" selling 7,000 copies and "Itsuka Futari de" 9,000.
On January 31, 2023, Shimabukuro Hiroko and stage actor Saotome Yuki took to their Instagram accounts to announce their divorce.