Why isn't simple and clean by utada hikaru on iTunes?

"Simple and Clean" by Utada Hikaru may not be available on iTunes due to licensing or distribution agreements that vary by region. Additionally, rights issues or contractual obligations with record labels can affect the availability of certain songs on digital platforms. It's also possible that the song is part of a specific soundtrack or compilation that isn't available for individual purchase. For the most accurate information, checking the official sources or the artist's website may provide clarity.