バクの心臓 (Baku no Shinzou / Heart of Baku) is Iyaiya-P's long awaited first album. It was first distributed at VOCALOID-PARADICE in Kansai. The album contains 8 tracks, sung by Megurine Luka and Hatsune Miku. A crossfade of the album can be heard on Nico Nico Douga. The album is purchasable on Amazon.