NBCUniversal Entertainment Japan
In 2005, Kawada signed a contract with Geneon Entertainment (now NBCUniversal Entertainment Japan) and released her first major single "Radiance", which was used as the opening theme to the anime "Starship Operators". Later that year, she released her second single "Hishoku no Sora", which was used as the opening theme to the anime series "Shakugan no Shana". It became her best-selling single and sold approximately 37,000 copies, peaking at number 11 at the Oricon weekly charts.