アザレアの心臓 (Azalea no Shinzou / Heart of Azalea) is Tohma's first full album which consists of 13 original songs. The limited edition of the album comes with a DVD. Most of the songs are sung by Hatsune Miku and GUMI, and two of them are sung by Tohma himself. It ranked number 6 in the Oricon Weekly Sales chart its first week of sales.
A crossfade of the album can be heard on Nico Nico Douga.