In 2006, Utada released their fifth studio album,
Ultra Blue, led by the digital single "
This Is Love". In February 2007, Utada released "
Flavor of Life", the theme song for the drama
Hana Yori Dango Returns, which became one of their most commercially successful singles, selling over eight million downloads and becoming the second most digitally successful song of 2007 globally. On April 20, Utada's song "
Kiss & Cry" began to be used in commercials for
Nissin Foods'
Freedom Project advertising campaign, and was released as a digital download on May 31. Utada's recording of the jazz standard "
Fly Me to the Moon", originally found on the "
Wait & See (Risk)" (2000) single, was rearranged and released as a digital download on June 29. Renditions of this song had previously been used in the original
Neon Genesis Evangelion animation's soundtrack, and Utada's version was used in trailers for
Evangelion: 1.0 You Are (Not) Alone. Utada took their inspirations from
Shinji wanting to see his friends and the real world again at the end of
End of Evangelion, and
Asuka's realization that she did desire love from other people. Utada's relationship with their mother, a musician herself, and her mental illness later in life influenced their
Evangelion songs; for this reason, they identified the most with Asuka. ==Composition and release==