"PSI-missing" is the sixth single released by the J-pop singer, Mami Kawada.

The song was used as the first opening theme for the anime series A Certain Magical Index.

The B-side Ame (雨, Rain) was used as an insert song on the twelfth episode of A Certain Magical Index.

The DVD contains the promotional video for "PSI-missing".

It peak ranked 14th on the weekly Oricon albums chart and remained on the chart for fourteen weeks.