Triangle -vol. 1-

==Background==
"Triangle -vol. 1-" is the first 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 previously unreleased songs by Yuuyu-P, Uramanbou, and mothy.
This album was only sold in K-BOOKS's stores, no online sales were released.
==Succeeding album==
Triangle -vol. 2-.jpg|Triangle vol. 2
==Tracklist==
==External Links==
===Official===
===Unofficial===
Category:Albums
Category:Japanese albums
Category:Albums featuring Hatsune Miku
Category:Albums featuring Kagamine Len