"みくのかんづめ" (Miku no Kanzume) is OSTER project's first official album (released same day as Neko no Kandume Premium, but Neko no Kandume Premium is considered to be the unofficial first album). It contains 18 tracks, all sung by Hatsune Miku and Kagamine Rin. It ranked number 12 in the Oricon Weekly Sales chart its first week of sales.
The official album website is available here.
The album is purchasable on Amazon.