Mechanical Mystery (キカイ仕掛けの謎刻) is Hinata Haruhana's first album. It consists of six new songs, five of the songs are all remixes with the Kagamines' appends.

A crossfade of the album could be seen in YouTube and Niconico, and is purchasable here (it can only ship in Japan).

Mechanical Mystery
Released June 12th 2011
Producer Hinata Haruhana
Price 1,155 yen
Illust. 7:24
Label Independent/Individual
Track list
1. ナゾトキ
Kagamine Len
2. ナゾカケ
Kagamine Rin
3. さあ、どっち?
Saa, Docchi?
Kagamine Rin, Kagamine Len
4. ココロ侵略robot
Kokoro Shinryaku robot
Kagamine Rin, Kagamine Len
5. My Vocaloids
Kagamine Rin, Kagamine Len, master (Hinata Haruhana)
6. ぼくにピアノを弾かせて
Boku ni Piano who Hika sete
Kagamine Len