"Mysterious Eyes" is one of Garnet Crow's two debut singles that was released on March 29, 2000. The two release marks the signing of band with the Giza Studiorecord label. The other single that was a part of this release was "Kimi no uchi ni tsuku made zutto hashitte yuku". "Mysterious Eyes" was used as the seventh opening theme for Case Closed in Japan and had a direct impact on helping it score in the 20th position on the Oricon chart. The song has some alternate versions too, those being "Mysterious Eyes ~dry flavor of G mix~" from the album "SPARKLE ~Sujigakidoori no Skyblue~", and, more recently, guitarist Okamoto Hitoshi created a version called "Mysterious Eyes ~Reason P.~", available for download using a QR code card included in his album "Now Printing...". The single reached #20 rank for first week. It charted for 11 weeks.