Triangle vol.4

==Background==
"Triangle vol.4"  is the fourth and final 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: natsuP, otetsu, and Uramanbou.
==Preceding album==
Triangle vol 3.png|Triangle vol.3
==Tracklist==
==External Links==
===Official===
===Unofficial===
Category:Albums
Category:Japanese albums
Category:Albums featuring Camui Gackpo
Category:Albums featuring Hatsune Miku
Category:Albums featuring Megurine Luka