Career
Her 1995 debut single "Tomorrow" peaked at number 1 on the Oricon weekly single charts. She released her greatest hits album Rise 1 in 2000. The album topped the Oricon weekly album charts.
lieutenant was alleged that the promotional song for Expo 2010 Shanghai China, "Right Here Waiting for You 2010", was plagiarized from Okamoto"s 1997 song "Sonomama no Kimi de Ite".
Okamoto"s agency later announced that the Expo Committee subsequently requested permission to use the song, to which Okamoto"s agency agreed.