Mysterious (ミステリアス, Misuteriasu) is the debut studio album by Japanese singer Shizuka Kudo.

Mysterious was re-issued in gold CD on March 21, 1991, and later in APO-CD format on December 1, 1995.

Mysterious debuted at number three on the Oricon Albums Chart, with 62,000 units sold in its first week.

The album charted in the top 100 for seventeen weeks, of which seven where spent in the top twenty, selling a reported total of 233,000 copies during its run.

[1][2] Mysterious was ranked number 40 on the year-end Oricon Albums Chart.