"ねこのかんづめプレミアム" (Neko no Kandume Premium) is OSTER project's first unofficial album (released same day as Miku no Kanzume). It contains 9 tracks and is the first instrumental album that OSTER project has released. All of the songs have a jazzy undertone with pop themes played on an electric guitar and other electronic instruments. The official album website is available here. The album is purchasable on Amazon.