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"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 Akuno-P.

Triangle vol 1
Released December 28, 2011
Producer Yuuyu-P, Uramanbou, Akuno-P
Price ¥3,500
Track list
1. おはようメトロトゥーメートル
Ohayō Metoroto Umētoru
Yuuyu-P feat. Hatsune Miku
2. 交通機関依存型勇者のミラクル文房具
Kōtsūkikan Izon-Gata Yūsha no Miracle Bunbōgu
Uramanbou feat. Hatsune Miku
3. 待ち続けた手紙
Machi Tsuzuketa Tegami / The Letter She Kept Waiting For
Akuno-P feat. Kagamine Len
Triangle -vol. 2-
Triangle vol. 2

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