Nanatsu no Umi wo Wataru Kaze no yōni

"Nanatsu no Umi wo Wataru Kaze no yōni" (七つの海を渡る風のように; lit. "Like the Wind That Cross the Seven Seas") is a song by Japanese singer-songwriters Rina Aiuchi and U-ka Saegusa. It was released on 11 April 2007 through Giza Studio, for the soundtrack of the Japanese animated film Detective Conan: Jolly Roger in the Deep Azure. The single became the duo's second single, following "100 mono Tobira" in 2006, which also served as the theme song to the anime series. The single reached number six in Japan and has sold over 36,587 copies nationwide.^[1]

In March 2007, Aiuchi and Saegusa announced that they would release the theme song to Detective Conan: Jolly Roger in the Deep Azure, the film adaptation of the Japanese anime series, Case Closed, for which the two had long written the theme songs.^[2] It was later confirmed that they recorded the cover versions of the past theme songs to the anime series, "Destiny" by Miki Matsuhashi and "Negai goto Hitotsu dake" by Miho Komatsu.

"Nanatsu no Umi wo Wataru Kaze no yōni" debuted at number six on the Oricon weekly singles chart and has sold over 36,587 copies in Japan, becoming Aiuchi's best-selling single since "Start" in 2004 and Saegusa's best-selling single overall.