Erroneous version of the third album in the series of releases celebrating KISAKI's 30th anniversary of band activity.

The album Preuve d'etre was originally scheduled for a 2023-06-21 release, but was postponed at the last minute to 2023-07-05 due to unspecified “defects in the songs”. However, due to some shops sending out copies early, a few customers received this erroneous version. Customers who received this early version were encouraged to mail the album back and received corrected copies for free.

This erroneous version contains a few mastering errors throughout the album, and incorrectly includes the song Mermaid (in a pre-mastering state) at track #3, instead of Pleasance as advertised. Mermaid would later be included in the final mini-album in the 30th anniversary series, Eternally—although said mini-album was not yet announced at the time of this release.