"Triangle vol. 2" is the second album in the Triangle series, which are given out as promotional albums for buying ¥3,500 or more worth of products. It is a mini compilation album featuring three tracks from three different producers: otetsu, PolyphonicBranch, and Akuno-P.
A crossfade can be seen on NicoNico Douga .
- Album Page - K-BOOKS